I just did something neat. To get good broadhead flight with fixed blades at decent speeds, it' s usually recommended to stay around 1" in cutting diameter. We all know mechanicals (for the most part assuming all the basic tuning variables are addressed) fly like field tips and offer large cutting diameters.

For chits and giggles, using a compass I drew a 1" , 1.25" , 1.5" , 1.75" and 2" circle.
Next I used my magination to superimpose them on a deer' s lung area.

Wow... there' s a LOT of difference in hole size, seems much more from 1 to 1.25 than 1.25 and on up each size.

I know a one" hole properly placed will kill them just as dead, but for blood trail purposes, larger holes look like they would rule.

I believe a quality mechanical has the edge here...