I like Stewart. I've had a Firehawk G3 for at least 10 years now, and have no complaints whatsoever. I like this screen as I do not "need" to have complete light control. It also has a positive gain, which is rarely a bad thing, especially now with 4K and HDR. Can't comment on AT screens. I have not had a setup with speakers behind the screen, so no personal experience to share. If you go to Stewart's website, they have a nifty screen selection tool that guides you through the selection process.

What aspect ratio are you going with? I'm a big fan of 2.35, or 2.4 if you prefer..... It does come with a cost, but well worth it IMO.

Laser DLP is probably the way to go, assuming the tech is there now. It wasn't when I bought my last projector, so I ended up with a JVC RS2000. It's been a great projector so far. I use the Panamorph Paladin DCR lens in front of it.