I have both. I really really like whidden non Bushing sizers they seem like the nicest for money that I’ve tried, but man o man do I hate their seating die, it’s not that it’s inconsistent, it’s not smooth like Redding and the top screw thing seems dumb, I’ve sold all of mine. I have the match master seater for my gt and the window thing is weird, but it works very well. I use a Hornady non bushing sizing die for that caliber, it’s been extremely consistent. I’m pretty happy with it, but if someone is selling a 6gt Redding comp seater I’d be on that like a rat on a Cheeto.