What type of fluid are you using?

It really doesn't matter ( really, it doesn't)
Dexron II, III or TypeF would be standard fluids with TypeF being a little firmer shifting.
You could run filtered French fry oil in it and probably never notice any difference.
That's about how much it doesn't matter. (but I'm sure there will be at least 3 pages of opinions and at least one argument over it.)

Of course then there are the specialty fluids like Royal purple (cost a lot more and do the same job and you wouldn't notice a difference with it either)

Just use cheap Autozone brand TypeF and use your money for things that do make a difference.