What is better skunk2 stage 2 or crower stage 2? if skunk2 is better how much power gain better? I'm running Skunk2/super tech springs and retainers on stock block and everything else stock...

 

the skunks will be more aggressive wether they are the pro's or the tuner series. how much power depends on a million other factors tho.

 

I've never used either, so correct me if I'm wrong, but looking at many other builds, it seems like the trend is that the Crowers make slightly better gains on engines without a built bottom end, but the skunk2's win all around with higher than stock compression. That's the Crower Stage 2's with the stock idle and larger VTEC lobe vs the tuner and pro stage 2 S2's.
Then again like you said, theres a lot that depends on many different variables.