Google AdWords and Overture’s management strategies are becoming more and more alike, but there are still key differences between them. The question still remains: Which is better for the PPC market today?
The answer is both. They represent a huge percentage of the market, and
one cannot exclude either when running a successful PPC campaign.

Fundamental differences in how Google and Overture deliver pay-per-click (PPC) advertising deserve your attention. They can affect your search ad campaign both subtly and significantly. If you understand and adapt to these differences, you can maximize return on investment (ROI) from each.
The major areas of differnce include:

1. CTR Used to Determine Ad Position

2. Length of Creative

3. Monthly Versus Daily Budget

CTR Used to Determine Ad Position
Arguably the most dramatic difference between Overture and Google’s PPC programs is their use of CTRs as a consideration in an ad’s rank.

Earlier, Overture ran an ad in whatever position the bid allowed (the higher the bid, the higher the position relative to other listings), regardless of the number of people who clicked on it.

Google considers click-through volume, as well as bid price, to determine an ad’s position in search results. The company will quickly deactivate an ad if not enough people click.

That Overture doesn’t consider click volume when determining an ad’s position in search results creates opportunity for some advertisers. In theory, some unqualified clicks can be discouraged without causing the ad to be deactivated.

Today, though Overture still doesn’t consider CTR in determining ranking, it’ll now deactivate an ad with unusually poor click-through volume. Although this new policy is in place and Overture regularly deactivates ads, its low click-volume threshold is apparently lower than Google’s. We do see advertisers successfully use language that reasonably limits unqualified clicks without causing their ads to be deactivated.

Take advantage of Overture’s model by ensuring your copy discourages unqualified clicks — within reason. Ad copy should include not only reasons to click but also reasons not to click. It’ll increase your conversion rate and help you avoid paying for unqualified visitors.

Length of Creative
Words are the tool advertisers use to persuade. Online, especially in text-only ads such as search, words are critical. More words are better. Words persuade the human mind. Though brief compared to direct mail, search ads still contain words, and it’s still about persuasion.

In this area, Overture’s ad unit offers a distinct advantage over Google’s. The title and description fields allow more characters and, therefore, more total words of copy. Overture allows titles to be up to 40 characters and descriptions to be up to 190 characters. Google allows titles to be up to only 25 characters. Total description length can be only 70 characters, 35 per line.

A hypothetical client sells home equity loans. In the Overture ad, there are six critical pieces of information that can be communicated
1. We offer great rates.
2. You can apply online.
3. You can get an immediate quote.
4. Great rates apply only to customers with good credit.
5. Product is only available in certain areas.
6. Home equity loans are the product.

The Overture ad might look like this, with 32 characters in the title and 175 in the description:
Great rates on home equity loans
Apply online for an immediate rate quote on a home equity loan! We offer great interest rates to customers with good credit. Not available in WY, VT, ND, AK, SD, DE, MT and RI
(Note the excluded states have smaller populations and likely fewer searchers. That affects click-through volume. If California and New York were excluded, the affect might bigger and Overture could deactivate the ad.)

Shorter messages have less persuasion potential. Shorter copy means we can communicate only four of the six pieces of information. The Google ad fails to say the product is primarily for those with good credit and not available to folks in certain states.

At Google you may pay for plenty of clicks from users with bad credit or from states where the product can’t be sold. Here’s how the Google ad might look (with 17 characters in the title, 29 in line 1 of the description, and 32 in line 2):
Home Equity Loans
Apply online for a fast quote
Get a great interest rate today!

Which ad provides more opportunity for an informed click? Longer copy in the Overture ad allows advertisers to more carefully qualify their clicks. This can potentially improve conversion rates from Overture clicks. We see slightly higher conversion rates from Overture ads and suspect it’s due to copy length. Longer copy allows us to write better, more qualified ads.

Monthly Versus Daily Budget
The last important difference between Google and Overture is how they decrement your spend. Google AdWords uses a daily budget, Overture’s is monthly.

If your Overture campaign budget expires before the 10th of the month, your ad won’t appear for 20 more days or until you replenish your account.

Google’s daily budget allows the company to turn your ad on and off all day to ensure you don’t exceed that budget. On any given day, your ad won’t be shown to some number of people who search keywords you’re targeting. There are only two possible outcomes when someone searches: they find you or they find your competitor.

That’s why "natural" search engine marketing is so important. If your site is found in algorithmic, or natural, search results (typically, below text ads), it generally remains there indefinitely. It’s not subject to a competitor’s bidding strategy nor to a limited ad budget (unless you participate in a paid inclusion program and your budget expires. But that’s a risk only in Yahoo! and MSN, for all practical purposes). A well-optimized site can ensure your site remains on the first search results page for months.

Optimize to ensure your site’s listed high in search results for your most important keywords — all day, every day.