Mechanicals are broadheads just like fixed blades broadheads are broadheads.

I am now carrying both in my quiver. I have both Rocky Mountain Snypers (mech) and Muzzy 3 blade (fixed) and I have them both flying together.

Now, both fly together, both are extremely sharp and both have taken deer quickly. Neither is better than the other.

The only pro of a mechanical that I can think of is the larger cutting diameters. People say better arrow flight but that is totally a misconception. People use mechanicals as a shortcut to a well tuned bow/arrow combo. Both fixed and mechanicals can and do fly perfect as my own example, both in my quiver, both drive tacks so how is one a better flyer than the other?

A couple pros to a fixed, always open tho I've never had a Snyper fail and uusually better built, fixed blades can be sturdier depending on make and manufacturer.

That's it in retrospect....if you have razor sharp heads hitting where you want, neither is better. Period.