What do you guys say is the major differences in v bottom and flat bottom jons?
A big difference is ride. A flat bottom jon, or even an mod-v jon, will ride rougher and tend to pound in a chop. The semi-v or v hull will cut the waves much better, ride much better and are in general, when comparing similar size hulls, more sea-worthy.
As far as seaworthy-ness & ride, from best to worst (IMO):
v-hull
semi-v hull
mod-v jon
flat jon
Another difference is draft, once again, when comparing similar size hulls, normally a flat bottom jon has the least draft, with a mod-v jon close behind, then semi-v, last is v-hull.
So you need to ask yourself some questions:
Do I need a boat that can handle rougher water or will I be in protected waters?
Is draft more important than ride?
If you will always be in shallow calm, protected waters, then a nice wide flat bottom jon will be fine.
If you may get into some choppy situations but not normally, and need shallow draft, a mod-v jon will be better.
If you will be in open water that tends to be rough and draft is not real important, then a semi-v or v-hull will be better.
I currently hunt out of a mod-v 1440. Next year, I will be switching to a semi-v 16 with a 64"-70" beam of one make or another. Leaning towards Smokercraft, Mirrocraft or Lund.
Tired of getting beat up when it turns snotty while duck hunting & really need a bigger boat.
Whatever you buy, buy the widest & longest you can afford and put on at least 90% rated HP if you can.
My 2 cents!