Google set electric

Help me decide bw 2 merchant account providers? - paynet systems

I noticed that accept payment by credit card. I reduced to 2 suppliers, AMS (Advanced Merchant Services, Inc. PayNet) or systems.

Thay also look good, PayNet cheaper, but AMS gateway authorize.net for free (you can line a basket-) use.
If you have any experience with the others?
Let me know your honest opinion. Thank you!