I'll hazard a guess that the average width of 'traditional' broadheads being used today falls between 1-1/8 and 1-3/8 inches. Obviously a number of people shoot 1-1/2” and larger widths, but I'm certain a majority do not. I'll also wager the vast majority are using conventional 2-bevel broadheads, no matter how many blades they have. There is nothing wrong with any of this, as it's worked well for many decades.
Keep in mind that today's single-bevel heads are available in widths up to 1.5” and maybe beyond. I own and do hunt with 1.5” single-bevel heads...a couple different models. There is no need to think 'single bevel head' is synonymous with 'narrow, skinny head'. Narrow heads in double-bevel configuration have been around forever, too. If you shoot a typical width broadhead, you've got plenty of choices in both single and double bevel heads.
Blood trails: I don't see a difference in single versus double bevel wounds, assuming identical hits and penetration. I've seen magnificent blood trails from both head types, and I've seen nonexistent trails too. The best blood trail is the one I don't need: the animal is down in sight. Next best is the shortest possible trail because every extra yard I need to follow blood means more chances to lose it.
Incidentally, the widest Zwickey available (Delta) is 1-3/8” which is more than enough to kill anything walking that bleeds. My preferred 'big' game head is also 1-3/8”, but it's thicker and heavier in weight. Definitely not a skinny head.