Mate it does depend, like what moni said. Unless the shell or dhol is really heavy it wont make much diference as you will get use to it. Just choose whatever you think looks good and sounds the best and see the link that moni posted for the mic. I recommend you get a kaali taali from india and get a shell with a belly. Kaali taali is the best wood. Get a shell with a belly because it does give a better sound than a straight - its just way better as it is curved and more importantly it keeps the rope tight compared to the straight which needs to be reroped often. If you want a straight try to get one with a very slight curve - they will be easier to maintain and sound betters but when u put on the rope and drum heads it will look like a straightThey both (curved and straight) can have different weights, depends on the shells thickness and density. Hope this helps
The curved barrel keeps the tightness of the rope as it has something it rests against while giing a bit of tension. A straight dhol desnt do that. When tuning a choosing a dhol you want one that will give you a slight ring after this and a curved gives this just because of the way its shaped. This is why i moved away from straight dhols-they started to sound flat after a while which gave me more maintanence. Thats why desi dhols are curved as they give you a ring (so when you play with an accent/stress it gives you a sikk sound) and keeps the ropes nice and tight otherwise they will be a nightmare to tune and rerope. But its up to you, if you want more of a modern approach or a dhol that looks good then get a straight like most people do but dont get me wrong ive heard some badd dhols that you can tell that the dholi has put a lot of work into. or if you want the traditional approach and the authentic sound get a curved barrell. What ive got is one inbetween as, its got a slight smooth curve which you can see only when the ropes and heads are taken off or if your close but otherwise it looks like a straight from distance. It still gives you the propeties ive said for a barrell but it looks like a straight. So it up to you and what type of dhol you want.