You're not going to find too many legit hardwood bed frames for sale in regular stores like The Brick, Sleep Country, Casper, etc. Best bet is buying something used if hardwood is what you want. I was trying for that myself, but ended up finding nothing. So ended up just buying a decent looking frame/headboard that's covered in a nice looking fabric.

If you just want strong, look into platform bed frames. It's stronger than slats, though you're generally limited on style and headboards that will fit.