Well, uh, which golden motor?
5 or six of your choices are more or less the exact same motor. That is, the 9 continent, 9 continent clone. Some object to the term clone. But in the end, it's basically the same motor, if the windings are the same.
They are so similar, you can swap stators between brands. They are all the dinner plate size motor with a 28mm magnet. They all thrive on 1500w, and can take 3000w if you keep the rides short enough. I must have more than 10,000 miles of commuting miles, mostly on these motors in either 9c or muxus brand.
Within the type, my favorites have been the slower windings. The 2810 winding was perfect for my commute. Though my commute was long, It was nice to have the greater range that resulted from slower travel, and less wasted energy on steep hills and stop signs. I ran it mostly on 48v 20 amps to keep it slow and efficient. 20 mph max speed, ideal for my commute route that was 75% multi use path or slow speed limit residential streets.
But for FUN, that same 2810 winding wails at 3000w, 72v 40 amps. Then you get 30 mph back, and really can climb steep hills with a cool motor, or just leave a stop sign grinning.
For off road riding, even better has been a super slow 2812 winding. I can still melt one, but it takes a real effort on trails that shake your bike to pieces. On a less rough trail, you simply cannot overheat one if you can maintain 15 mph.
I ran the muxus 2810 on my cargo bike too for a time, and was considering dual motors for it. But when I got a crystalyte 5304 motor, the cargo bike began to really shine. This monster of a 25 pound motor feels awkward to me on a regular bike, but on a frankenbike that weighs 100 pounds sans motor or battery, it's weight is barely noticed. This well known entry into the early monster bike hubmotor category just kicks ass for a cargo bike. But, it's capable of 5000w, so it's not really part of this 3000w and less discussion.
Back to the 28 mm motor subject, the typical winding is a 2807. That winding is real nice too, but it tended to leave me using 100% of my battery on my long commute. It really is a good winding for people intending to run 36v. On 36v, about 23 mph of speed, just within the pedal cadence of a bike with 48 front 14 rear gearing.
The majority of the vendors I know of tend to sell the 7 turn, 2808, 9x7 winding in the kits. A few might have slower versions, or faster versions in their lineup. E-BikeKit has a slower motor trike kit for example. The place that really has a selection of different winding speeds in all the motors sold is EM3ev. I believe he stocks the 10 turn muxus.
I always wanted to try the 2808 or 8x8 winding, but never got a hold of one. I really think that would be the ideal winding for use in the USA. Especially in places serious about a 20 mph rule. It would climb slightly better, and leave stop signs slightly more efficient than a 2807, and still reach 19 mph on 36v.