Flow wise, the trickflow flows 245cfm, the Edelbrock 225cfm and the explorer just over 190cfm per runner. Power wise there won't be much in it when you take into account 200cfm per runner is roughly equal to 400hp of flow. If you can get an explorer cheap, get it, otherwise get the edelbrock one IMO, but not the RPM one unless you run it on a stroker.
Also, the explorer is fairly easy to port if you have a spare hour or two, and should flow well over 200cfm after.
Here is the data I got out of the MM&FF testing (I think it was that one anyway. I just threw it into an excel graph and it shows minimal differences between the explorer, edelbrock and trickflow. Also remember that the test car is putting out 330rwhp or 245rwkw. ----> graph