The main fret wire maker, California-based Dunlop Manufacturing Inc., produces five main fret sizes. Listed by part number, name (where applicable), crown width and crown height, they are, from smallest to largest:
6230: The smallest fret wire found on older Fender necks (.078? x .043?).
6150: Vintage jumbo. Much wider but not as tall as 6230 (.102? x .042?).
6105: Modern narrow and tall; currently very popular (.090? x .055?).
6100: Jumbo. The largest fret wire available (.110? x .055?).
6130: Medium jumbo (.106? x .036?).
Which size you like is purely a matter of preference, although it can affect your playing style. If you like your fingers to actually touch the fingerboard when fretting the strings, frets that aren’t very tall like the 6130, 6150 or 6230 are for you. On the other hand, jumbo 6100 fret wire can provide easier playability with better sustain, tone and bending because you don’t have to press as hard to fret the strings, but your fingers probably won’t even touch the fingerboard, which could take some getting used to if you’re accustomed to smaller frets.
The main guitars I play are my Made-In-Japan EVH Wolfgang Specials. One of the primary reasons I love these guitars so is because they (and the MIC models) are the only EVH Wolfgang Specials to have “Vintage” frets on their fret boards. When production moved to Mexico in 2014, jumbo frets were used on the Specials, and they have been that way ever since. Now, only the USA made EVH Wolfgangs come with “vintage” 6230 sixed frets.