I prefer broadheads that remain undamaged and penetrate well. Broadheads that bend or break in game suffer reduced penetration and tissue damage.

I used to use mechanicals. They ripped apart in each of 3 deer I used them on. In one case, penetration was downright pitiful. I stopped using them.

I also used to use replacement/fixed blade heads. About half of those heads suffered severe damage with around a dozen deer. I tried several different brands and models until I stopped using them as well.

I've since come to prefer one-piece, fixed blade heads. After taking 8 deer, NONE of the heads suffered ANY damage and each penetrated very well. Grab a file, resharpen, and go. Magnus, Snuffers, Woodsmans, etc. all fit the bill nicely.