That can be a hard question since both types can yield excellent results. Both types are much more simple than filling out long form or signing up for a free trial offer in which they'll have to give their credit card number. You'll get paid whenever someone fills out a form with a valid zip code or email address.
However, you'll find that zip submits can be much more versatile. They can be used for virtually any type of offer within a given area. You can promote television sets, shopping sprees, and many other types of products and services.
When comparing email and zip submits, you'll likely find that the latter offers even higher conversion rates. When someone fills out their zip code, it's not really information that can be used to identify them.
This certainly isn't the case if they give out their email address since they're the only one in the world that uses it. Zip submits are also even easier to fill out, since visitors only have to press five keys and click the submit button.
You should know that the payout with both of these types of CPA offers will vary. On average though, you can expect to make about $1.50 each time a visitor you refer gives the advertiser their email address or zip code. Plenty of marketers opt to promote higher-paying offers once they gain experience and traffic to their websites. But if you're just starting out, this can be the best way to go.
Now i ask you warriors, Which one do you prefer? and why?