I’ve gone from fixed to mechanical several times and although everything I’ve shot (thunderheads, muzzy, slick tricks, rage, jack-hammers, land sharks, etc) has killed deer I have now settled on and use Wasp Jack-knife. It’s a two blade expandable. I like the increased cutting diameter and don’t have to worry about tuning. The fixed blades I like the absolute best are slick tricks, hands down. If I shoot any more fixed that’s what it’ll be. Tough as they can be and usually fly well.