Flat Rock vs Slate

Like the title says. Which do you prefer and why? Pros and cons of use so far? Im torn between the two. In the store the Flat Rock seems sturdier and made better but seen reviews both ways. A lot of social influencers are given the slate to use so dont get any real feedback from them.

Ive had the regular weber and didnt love it and also had the blackstone which was junk to me.