Highest flowing sbm heads?

I gotta ask a few guys a question or two. Do you dislike the BPE, ProMax, Airwolf, and about five other Edelbrock copies too??? Or just Speedmaster??? Just curious if you know they all use the same offshore castings???
I own a set of ProMaxx heads. No issues.
BPE is Bloomers heads? No issue. Don’t own a set. I see it as a niche head since it is not easily purchased by anyone. No disrespect, but I see it as a FB head since you need FB for the most part to get it.
Air wolf heads, similar as above but worse since he is mostly invisible and as far as I know, isn’t in biz.
The speedmaster head as cast hasn’t be shown as all that. Funnier yet, I read guys getting them thinking they’re going to turn low 11’s as cast or make 470+ lbs/tq and get upset when they’re slug slow.