in my experience 3/6 and 5/10 are baiscally the same - only difference I have seen is that 5/10 players have a few more tricks up their sleeves that are done at the correct time (as opposed to the tricky plays in 2/4 that are done at random bad times).
2/4 is the softest games at party, softer then 1/2. 3/6 games are tighter by about 5%, More aggressive PFR by 1% and smaller BB pots.
The average BB/100 in 1/2 for the average player is -3.53, in 2/4 its -3.04 and in 3/6 -2.71, so you see it's harder.
BUT - still lots of fish, just more good players.
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