Many people here will tell you wear the boot that fits best and your probably going to respond... THANKS CAPTAIN OBVIOUS!!!
The thing is snowboard boots are also lot more demanding of fit then regular sneakers. I bought a Burton last year because it's a name that's ubiquitous to newbs and I thought I couldn't go wrong with it. Boy was I wrong! It was uncomfortable as hell and I was getting crazy heel lift if I wasn't cranking it down super tight, which led to a lot of foot pain. Nothing wrong with Burton, but it wasn't the right boot company for me. Other people swear by it.
For my second boot, I tried on over a dozen pairs and finally settled on Salomons. It was a perfect fit and not only did it make my riding 10x more comfortable, but I progressed my learning exponentially.
In short, don't stick to a brand... just listen to your feet.