One more thing. Budget. You'll probably wonder why there is such a gap between low-end bindings and top-shelf ones. We're not going to go through every detail that makes a price but basically, the more money you'll spend, the more comfort and performance you're gonna get. Higher-priced bindings are generally better padded. They feature softer dampening systems, cushier straps, ergonomic highbacks, and so on. A binding can literally ruin your day. If your straps are not nicely designed they can alter your bloodflow or create pressure points. A highback can create calf pain and make your legs sore for days. Sometimes, it's really worth spending a little extra and getting something you actually feel good in.
You're also paying for performance and durability. An aluminium chassis, magnesium buckles and a urethane highback are obviously going to last longer than a plastic chassis, buckles and highback, but they're going to be more expensive. They're also going to feel more responsive and more reliable. If you're only riding a couple of days a year then this is totally fine, bindings are meant to be ridden no matter what they're made of. But if you're advanced, if you ride several weeks a year and rarely hold yourself back on the slopes, then you may want something that can withstand your treatment :)