I find that charring my handles a bit and then rubbing a beeswax/camellia paste on them when still warm just gives them a wonderful feeling in the hand. Don't know why. And the fact that it looks awesome makes me feel nice about life.
I always seem to prefer weight forward hammers, be it dogshead or ball peen. I've only swung a French pattern once, but I really liked it.
I often feel like there are two schools of thought: guys swinging lighter hammer heads on long skinny handles, and those who use somewhat heavier heads with shorter, thicker handles. I vastly prefer the latter, but I am willing to admit I am no expert on hammer technique. For whatever reason (personal physiology most likely), I find the downward acceleration of a light hammer head much more aggravating to my wrist, whereas letting gravity bring down a 3# head or so just feels better. Skinny handles also seen to really aggravate the joints of my hand. Once, I found a sweet-looking octagonal handle I put on one of hammers. It took me months to figure out why my hammer hand was hurting so much... Never again!