It’s the height of the fret over the fingerboard. I find it too easy to make the strings go sharp when fretting notes (especially when there’s energy/adrenaline flowing). I prefer a shorter fret where I don’t have that problem.
FWIW, I’m not as concerned with fret width; it’s mainly about the height. That’s why the “medium jumbo” frets work fine for me.
And I should note that all that is just preference. Some people prefer tall frets. There’s not a right or wrong answer.
I like Schecter neck profiles; I agree they feel good. I couldn’t find a Schecter that met my other criteria. You new build sounds awesome, though!
All that makes sense. I agree you can adapt; I move between guitars with different specs all the time, and it’s not a big deal. I don’t need to have a guitar with exactly such-and-such specifications. But I still have my favorites. It’s taken me a long time (and playing a lot of different guitars) to narrow down exactly what I like the best.
That sounds a lot like the Squire Contemporary Jaguar HH ST. I took a very hard look at it, but it has jumbo frets and I don’t want to compromise on that. If you don’t mind jumbo frets it sounds like exactly what you want: 24" scale, two humbuckers, 12" radius, Fender-style C neck, painted.