quick q- Tights?

Asos have coloured tights on clearance.
I'm going to get navy and (darkish) green
but they sell them in 50 and 80 denier

I'm not sure which to get?
They both say opaque

Are 80 denier tights thick feeling??
Or is it not That much of a difference and I'm therefore better off getting them cus they'll probably last longer?

I don't want really thick ones but I don't want ones that are sorta semi-sheer either.

Edit: I can't get 50 now. The green ones are gone in 50 and the blues have sold out in my size!
I'd still like to know anyway for future reference

i think....that if they are a higher denier then they will feel a bit thicker but not too much. like not omg theyre so thick.
ive got some good quality tights that do feel thicker than my cheaper ones.