I've shot quite a few different broadheads. Both fixed and mechanical. You can hear from anyone and everyone, which blade is best. The endorsement of any product comes from people (in such a wide variety) because it worked for them. The common denominator is the fact they put a sharp blade through the vitals at that particular time. They all work. Broadhead tuning is important no matter the brand. Shooting accurately is important no matter the brand. Shooting a sharp broadhead is important no matter the brand.
One thing to note discussing mechanical versus fixed is the amount of energy that is consumed to make a mechanical open, then cut. Most, I repeat, most mechanical are not cut on contact. If you shoot a tuned, fixed blade broadhead that is cut on contact, that is sharp you can get more distance out of an arrow that remains lethal. In other words, you can typicallt kill them farther. If you are shooting under thirty yards, there's no arguing that both are pretty equal. If you are shooting lower weight, slower speed bow, I would suggest fixed and also cut on contact, as a broadhead.
I shot a deer just yesterday with a mechanical broadhead. Brand? Not important. Three pack was $22. I shoot 70 pounds and maybe 260 fps. I am shooting a very heavy arrow at today's standards at around 500 grains, but my typical shot is 20 yards. It doesn't matter what I shoot. It will kill a deer at that distance. I shoot what's cheapest at the time, and will tell you I've killed at least 50 deer with at least twenty different heads. Last year I was using a three pack of cheapos that cost me nine dollars. Head shot a fox, took a doe and a coyote through the ribs. The broadheads at that price were disposable, and I don't care what they look like after killing a deer.
To sum it up. If you want something you can shoot more than once, and possibly don't have to replace blades every time, the the G5 Montec is a brand I would endorse. Small cutting diameter, need sharpening imo out of the box, but a very sturdy head. You want a mechanical? Personal opinion here, but I would get front deploying heads that are held in place with an O ring. I look at mechanicals as almost certainly disposable, and that will cost you that $15 bucks if you hit or miss lol. So after my 34 years of bow hunting (and bought it all) I've concluded that I wait until they're at close range, stick them where it counts, and all of them work. Oh, and I practice so much my beer belly shows it!