They all have their benefits and drawbacks. And honestly, thinking of them all at once, I'd have to say I kinda don't look at any of them overly fondly, nor preferred...
- Tolex is less likely to stink. But hit something sharp against it and you have the beginnings of a tear.
And if you've ever bought an incredibly low priced Peavey amp/cab from the 80s/90s that is tear free, but lived in a garage or basement... you know that no level of toothbrush-scrubbing-with-soapy-water will EVER remove the dinge from it. You can get it okay for a minute, you can gloss it up with Armorall or mineral oil or tire shine... but it will hold onto dirt in those crevices for eternity.
- Rat fur is the preferred claw sharpening material of cats worldwide (I purposely don't have a cat, by the way). Many a decent cab has been really turned uggo by that fact. And that's if they were lucky enough to ONLY be used as a scratching post and not a litter box.
You can actually use clippers to smooth it out. I've given my cabs a bit of barbershop treatment to help not look nearly as bad.
If you have a cab with clean rat fur that has avoided Mr. Whiskers, you would only truly be lucky if it also lived a clean life. Because in a jam spot where people smoke, use incense, spill beer, or exude sweat, there is a possibility of being funky for life. And not in a way that gets people on the dance floor.
- Rolled on finish (not sure if they are all Duratex or even if that is what GK uses on the 2nd gen MB210 combo, but that is what I have for comparison) would be removing 2 of the issues above:
1) It doesn't get a tear in it which is unlikely to hold glue well enough for repair like tolex;
2) It doesn't attract murder mittens, nor does it hold onto stank, as the rat fur tends to.
But... it's NOT super durable. Or at least my GK is easily dinged and it shows.
That said, I don't mind using a sharpie or some nail polish to hide it in a pinch. I wouldn't buy a can of it for touchups, but if I had to redo any cab with anything from scratch, I think this method would be the easiest one to manage. I have painted cabs with house paint (it was cheap and the end result was good enough, like the car interior overhaul in Pulp Fiction), the process was comparably simple.
I've attempted fabric work on cabs and it's a nightmare.
For me, cabs (cases, heads, racks, etc) with these options don't really play into my choice if the price is compelling. And I see all of them as "wear items" to some degree, as they do move around and get worn from it. So if it's structurally sound, not reeking in a way that can't be fixed, makes proper noise, and comes in where my budget finds it acceptable... I'll get it.