what optics for my 75/92gal?

So as of now i have one of the reefbreeders led value fixtures with 120deg optics 12" over my 75 gallon(soon to be a 92 corner tank)

I am buying another fixture, and was thinking of getting the 90deg optics for it.

But then i was really not sure what would be better? 60 degree or 90 degree optics?

Each light will have to cover a 2ft long by 18in wide by 21in deep area essentially.

Hanging hight can be adjusted as needed.

So what does everyone think? And also when i upgrade to the 92, i know its a weird size shape so not sure what would be best for that either.