How many different 338 Lapua IMPROVEDs

[Shooter ----/]

So I'm trying to figure out how many different versions are out there and what the opinions are on them. Pros / Cons.

I know there are a few guys out there shooting these "Boomers" and I'd like to get some opinions before deciding on one for myself.

338 Lapua improved 35 degree
338 Lapua improved 40 degree
338 Lapua improved Yogi
338 Lapua improved Speedy