I'm more partial to a bent pipe than a straight. I like to clench while doing things and the bend is much more comfortable to me, while straights seem like the balance is all in the bowl end, making it hard to hold in my mouth. That doesn't mean that I haven't found a couple of good straights, just that I'm not prone to smoking them.
Meerschaums to me are a bit of both. I love the carvings, especially by Yanik. However, for smoking, I prefer something that resembles a pipe to smoke. Cobs don't do it for me, however, I'm going to keep one and try it again soon just to see if my tastes have changed any with them.