Don't buy cheapo thin sheet pans, they'll warp, stuff will crust onto them, and a lot of times they're not standard sheet sizes. Get the nice (and actually not really expensive) heavy ones. I have Chicago Metallic and similar Nordicware thick, commercial quality sheet pans. I pair them with silicone baking mats (or parchment if I've been lazy about washing), and they are some of my biggest kitchen workhorses. I use them almost every day, not to mention I'm a big baker, so they also get tons of cookie and sheet cake use.
Aluminum or aluminized steel is good. It's just some sheets of metal, so there's really nothing to futz about or mess up with them, and they're dishwasher safe. I'd recommend against nonstick sheet pans - they're kinda fussy, and a lot of times nonstick pans are darker and require different baking times, or have weird textures on their surface. I was using a half sheet and a quarter sheet for a couple of years, and decided to double up this winter and got another set of commercial grade half and quarter for about $35 on Amazon. Pretty sure they'll last me until I decide I don't like sheet pans anymore.
Edit: TLDR: Don't buy super cheapo pans, commercial grade aluminum pans are already inexpensive, high quality, and low maintenance.
Edit: link is dumb x a zillion.