I'd start by considering a couple of questions:

1. How much light output do you need?
2. How long do you need it?

The first depends mostly on your commute route. If it's on reasonably well-lit city streets, the I'd suggest 300 lumen is a good minimal brightness. Unlit country roads and you might want to step up to 600 lumens or so. Adjust based on various conditions (e.g. if your route has lots of potholes and you haven't memorized their location yet, go up in brightness.)

The second is really just how long is your ride. Consider, also, the worst-case scenario of having to change a tire on the way. Make sure the battery life (at the brightness you'll use; see above) is at least that long.

Once you've answered those, just stick with reputable brands (really, any reputable brand) and find one that fits your price range, esthetics, etc.) REI is a good place to look as all the brands that they carry are fine.

Edited to add:

FWIW, after trying lots of lights over the decades, I've settled for now on the Fabric Lumabeam. Relatively modest light output and battery life, but for me the big selling points are (1) very small and light weight, (2) easy to use controls to change modes (rotate the dial, no messing with multiple button presses etc.)