re: Blackstone griddle or Weber gas grill ?

A sort of middle ground is Grill Grates brand replacement grates for the Weber. I ordered these during Covid shutdown as retail therapy, and they turned out to be one of my favorite purchases.

They have bars on one side for impressive grill marks, if you like that. Flip them over and get a flat surface with small holes in it. You probably couldn’t fry and egg on it due to the holes, but the flat side is great for fajitas, searing steaks, fish, etc. I pretty much leave mine on the flat side all the time, but sometimes mix it so I have a segment with bars and the rest flat.