I just went through this myself. I tried on Burton, Nike, 32, and Salomon.
I don't like Burton because the last 2 pair I had packed out a full size. So you're either trying to stretch out a boot which is too small (hurts like hell) or you buy them comfortable new and you'll get 20-30 days out of them before they're way to big and you lose board control. I also had an issue with their speed zone laces loosening while riding. The problem with this is the components that wear out and cause the boots to loosen can't be replaced. Unlike Salomon that uses screws so you can replace your hardwear, Burtons are riveted on, so you gotta buy brand new boots every year (it's almost like they planned it that way for some reason).
Hated Thirty Two's!!! The liner was so uncomfortable even after heat moulding and I had way too much room in the toe area width wise even though I had no room in the toe area length wise (without sizing up and getting horrible heel lift). So I went with the smaller size with the hopes they'd packout. After walking around my house for 4 hours my feet finally felt better when they went numb and I lost all feeling, and it was only better because the pain finally went away. Fucking terrible boot, needless to say I returned them.
Nike felt ok in the store for the short time I had them on. But they are a narrow boot and I knew if I had these things on for a long period of time with thicker snowboard socks circulation would decrease and I'd have cold numb feet all day.
This brings me to the Salomon F22. I slipped my foot in and was instantly greeted with the most comfortable, supportive, soft cushioned stiff boot I've ever tried on. It reminded me of my first blow job. Greatest feeling in the world. I have no idea how they'll packout or how long they'll last but they feel already broken in (before the heat moulding!) and the laces & components that go along with them can be replaced, which is huge.
I'm sold on Salomon, you should look into the F22 or Malamute. P.S. I wrote this on my phone so if there's any spelling or grammer issues, fuck off