I figure the universal reclaimer was the legacy layout, but zoom & shoot was very modern. I’m not sure what is best. I know others use other layouts but I want to know if zoom shoot is viable and in which games?
Controller layouts are entirely subjective, there isn’t really one ‘good’ one unless you’re playing very competitively.
Zoom & Shoot is designed to replicate layouts from other FPSs, like CoD or Battlefield. It is mostly there for people who just don’t play enough Halo to get used to its unique default controls.
It’s probably most viable in Halo 4 where you won’t get descoped when you take damage.
I like it as it marries well with most fps titles .so I can change games with a minimum amount of fuss .
It’s not a bad layout by any means. If you’re used to most other AAA shooters’ controls, you’ll definitely like it!
With that being said, here’s the obligatory “Bumper Jumper for life” comment. 
