Just my opinion...
H2H is more baseball-like. If Pujols is destined to hit 40 Hr's and 120 RBI's, it doesnt matter when he does it. He can have those totals by all-star game but it still is 40-120 in the end. In H2H it does matter!! If he goes into a 2 week slump your team tanks with him, basically. Thats luck, the way it goes, slumps, call it what you like. Look at the Cards in last years W.S. They slumped, choked... THATS BASEBALL people. Its not crisp and clean like roto.
In 1 of my leagues last year the 1st place finisher played the 4th place finisher in the W.S. Guess what? The 4th placer won it because of a 2 week slump by the 1st-placer. Thats Baseball.
I play both for variety but in dynasty keeper league its H2H.
BTW...my 2 championships ever were in roto.