What Freebie script is this...?

[iambobbydigital]

Hi I was considering starting one of these freebie sites and was just wondering if any body here knew what script these guys were using:

Welcome to ConsumerRewardZone.com
Welcome to GenerousGenie.com

Ive done a bunch of research and found these scripts:
sFS - Project Page
FSRevolution
myeasyscripts.com
The Freebie Life Scripts
Project RAFS. easy. customizable. profitable.
FSRS - Home

I was wondering if anybody had any experience with them and could suggest one that is best to work with.

thanks!