Backing advice

I've seen many reviews for fly lines, but hardly ever any for backing.
I realize it is not as important in many situations, because an 8" brookie
never pulls more than about a foot of fly line. However, I also want to do
some salt water fishing, and know backing choice will be much more
important.
I know Orvis, SA, and others make small diameter backing. Does anyone has
advice on the best backing (for the money)? Anyone compared a couple brands
and have preference?

Thanks
Hammer