some guys find the marvel oil works great - others like seafood. I like both/either WHATEVER magic goop will maybe help (for a few bucks a bottle) and save me a ton of time/money and not cause more problems.
SO - think of what you are trying to "cure" - potential "sticky" valve. Where is it likely to be sticking? Well, where is it trying to move? Up and down in the valve guide is where, and there is a little bit of oil that gets in there (very little) - just what adheres to the valve stem as it slides up into the oily mist in and around the valve springs and then is shoved down past the valve stem seal (through the guide of course) until fully open, and then back again. So ... answer your own question (yes I am being pedantic here). Where would the logically correct place to put an ounce or so of either liquid for this suspected problem?