It depends on a couple of things:
Shape of the horse’s mouth.
How he is trained to respond to however much contact.
Nature of your activity and the outline you want.
For a Western-broke horse, who responds to a hair-trigger “signal” on a fixed-shank bit, a regular broken snaffle with heavy contact will make him miserable;
For a horse who’s been taught to relax his jaw and poll with a soft chewing motion, provided he has palate room he’ll be happy as a clam. The best of both worlds, regrettably seldom seen today, is the double or “full” bridle.
My own preference is for any horse to be “light in hand,” meaning, I don’t have to use muscle to communicate with him by either hands or legs. It is not impossible to achieve in most any bit if you “give” the minute he does as a reward.