Definitely both! Don't limit yourelf to one AVS system! There's tons of them. You should mirror your site for as many as you can. Don't forget to send traffic to them as well.
I suggest you go over to
http://www.avslounge.com and read a bit. They are very helpful when it comes to the ins and outs of AVS.
Also definitely try
One Verify It's the AVS run by the folks at Top Bucks. They send a ton of traffic to your site!