what is the difference between the ps1 and n64 version of the first 3 tony hawk pro skater games?

i also want to know what the difference between xbox and gamecube versions are. thps3 is on gamecube and xbox and thps2 is on xbox.
so how would thps3 compare on the gamecube version. the gamecube version looks like it could have been done on the n64.
steve, i was asking cause i just happen to be able to play the ps1 versions of those games.