1.7 or 1.8 rocker arm?

just wanted some advise from you all of you guys.
i will have an after market cam soon, and was just curious if i should just get the slightly bigger cam. and stick with 1.7 rockers or get a smaller one, and have 1.8's instead=\ not sure which one will yield the most performance gain in the end. along with durability.
thanks in advance.

im going with hot cam and 1.8s thats only a 5.25lift cam so i think i will work out good for me with stock heads and manifolds

im going with hot cam and 1.8s thats only a 5.25lift cam so i think i will work out good for me with stock heads and manifolds