I would definitely send traffic to them and see which ones do better. Traffic has such a huge impact on conversions. I have tons of affiliates doing 1:50 with our site
http://www.brokestraightboys.com and then I have affiliates doing 1:200 so it really depends on traffic. I have some affiliates that can convert our other sites way better than our #1 site Broke Straight Boys. It is strange how much it varies. I hope that helps.
Mark