I like the standard Martin fret wire on my acoustics, and for electrics I use Dunlop 6150's. These seem to be right for most people.
The primary difference is feel. Some players find that they can play faster with really tall frets, like the Dunlop 6100. The problem with this is that you must have very clean technique, because if you push down too hard you will mess up the intonation. Other people like to feel the fingerboard under their fingers when they play, and so they like smaller frets. The old Gibson Les Paul Customs had such small frets, they where called the fretless wonder, and for some people that is what they want.
I find that I want a slightly larger than average fret for my electrics, as it makes it a little easier to bend, and it allows for a little easier vibrato. The 6150 is a true jumbo fret, but not huge. On the acoustics, I am a fairly light fingerpicker, and I almost never play lines on most of my acoustics. I don't need the larger frets, so I use smaller ones. They just feel easier to play, for me.
Your Fender probably has something along the lines of a Dunlop 6105, though they may be smaller, like a 6230 (though I doubt that), which would be consistent with the really old Fenders.
Light
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