I want to user FirstClick (Which now is Value Click Media). question is I have 4000 uniqe visitor from worldwide & they visit every day. means that, in month more than 4000*30=12,000 impression user give us. & now it upgrade day by. So how much i can earm from this kind impression if i use FirstClick? or If i use Google Adsense, it will better from FirstClick?
Just test, you can't find out by other means, test with Google Adsense for a period of min one week and then switch to FC. This way you will know for sure what to keep.