There Is only benefits in shooting wider BH in most of case (except for buffalo, hippos, giraffe or elephant ...). Of course you may brake ( but not sure you will) more easily shoulder bone with narrow 2 blade but bony volume and area is much smaller than soft tissues volume and area when you look at a critter in fair shot angle. So you have a higher odd to get a soft tissue bad shot rather a bony one.
Regarding to penetration at shot distance with fair bow poundage difference is not that much . At least in a close-to-new crossbow target that is rather soft tissue high resistance model: all in a 1/4 " overall difference if any, and here the less penetrating arrow was with the lesser sharp BH ...
Here are 4 types of BH all razor sharp except the 1 1/4" 3 blade VPA just factory sharp out of box(not bad but not enough for my standards)
As you can see minor difference,
3 blades 1,5" big Jim 300 gr (re sharpened so 290 gr)
3 blade VPA 1 1/4" 250 gr
2 blade VPA 1 1/8" 250 gr
2 blade Magnus 1 160gr+ 125gr adaptator
Same 32" GT traditional 300 shaft
Yellow feathered arrows are 695 gr +\\- 10 gr and red one 720g gr ( big Jim BH on it) and 300 to 310 gr total point weight
20 meters (22 yards) shot with same bow, tutu EX 59# same archer.