I hate these 'Which is the best AVS site' questions.
It depends if you want recurring income, what type of niche, if you have your own traffic to send, how many pics you have, quality of pics, whether you want the linklist traffic to upsell, or if you are trying to sell AVS memberships.
I like Sexkey for their Linklist traffic, and the odd membership sale.
I like AdultCheck and Adult Verifier for recurring Income on membership sales.
Answer a few of the above questions and I will tell you which AVS to use.
Wildman.
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A New way to Wealth -
http://www.avscash.com