The actual locking mechanism of a Warn #9790 Standard and a Warn #20990 Premium are virtually identical. Only the outer knob mechanism and the interface point of the inner locking mechanism are changed between the two.
At least that's how it used to be, and I'm not aware of any changes in the last few years.
My relatively new-ish #9790's look just like I remember them being back in the day.
Most other aftermarket brands are a slight variation of the same mechanism. Differences in dimensions, in materials, and probably enough "design" bits to keep from stepping on a Warn patent. Unless they just use the patented parts too.
And then again, only if Warn re-upped the patent, as it's been WAY over the normal patent protection duration if that's still a thing? About twenty years or so maybe? Not sure how that all works, so maybe someone else can fill in that blank.
But the design has been around for probably near 50 years now. And factory Ford OE parts for 40 of those years.
One nice thing about the stock Spicer units (other than being of strong steel construction) is that if the outer knob is ever knocked off, or falls out or fails for some reason, the default position is "LOCKED" for the inner workings. The opposite for at least most of the aftermarket units. The Selectro models may have had the same default.
This used to be a big concern, what with skinny wheels and tires and hubs sticking way out in harm's way. With so many using wider wheels and tires that help to protect the hub, and with so few actually getting off the pavement, this is not really such a big deal anymore.
I'd have to say that the stock Spicers and their Yukon counterparts would seem to be the stronger models to me. Never used the MM premiums on a Bronco myself but do have them on my F350 and they don't seem any different in design from the others except for being larger and with some steel in them (instead of mostly aluminum). Same "2-piece" design, same locking mechanism, same type of knob.
I much prefer the action of the stock ones, as the MM Supreme (I think that's the model I have) knobs are just as hard on my fingers as the Warn Premiums are.
The old Selectros with the whole outer knob turning, that eventually morphed into MileMarkers were well thought of and highly sought after for a long time. I don't remember the model #101 you guys speak of specifically. Is that the Selectro, or one of the other ones?
Don't remember warrantying more than one or two sets of those over the years. But a week didn't go by that we didn't warranty or sell several new sets to replace a broken Warn, MileMarker, Superwinch, the private labels like Cepek and whatever the others were out there.
Probably fewer Superwinch hubs than just about anything else, but it's hard to say if it was due to higher quality, or just to there being more Warns in use than Superwinch.
Anyway, I'm a fan of the stock ones. Never had any experience with them being finicky, but I've said before that was probably my use in a very mild climate, and my tendency to have them apart for bearing maintenance more often than most.
I can't say brand new Spicers (should they have been available) would not be every bit as expensive, if not more so, than the new Yukon Hardcore hubs. At $335 a pair, it seems appropriate for that style of part and volume of expected sales. Selectros are in the same $300+ (up to $600!) price range.
Hard to argue with the pricing of the others, especially if you don't intend to use your Bronco hard in 4-wheel drive.
Since the finish on the knobs is peeling off of my MM hubs (likely they were the chrome ones instead of stainless then!) I'll probably paint the "pink" knobs back to red and put the stock ones back in.
Or save up my money and buy some Yukons.
Paul