The Mule 1000 & Storm 1000 both come in 17" and 19" frame size options so you should be able to find the right sixe for you both. The 17" frame is best suited for heights ranging from 5’2" to 5’8" and the 19" frame for 5’8" and above. BackCountry eBikes are the makers or both models you like and they are hunters based out in Ogden Utah and they don’t make average bikes, they focus on elite hunting bikes that will get the job done. They are designed to take a beating a perform well doing so. Both models have that coveted ULTRA mid drive motor so climbing hills and tackling rough terrain offroad will be a joy to experience.
The Moterra Neo is one of the shorter travel e-bikes we've tested. It has a 140mm Rockshox Pike fork and 130mm of rear travel. That was enough travel to handle everything we encountered on the trail and the shorter travel was welcomed on less technical terrain. It uses a Bosch Performance Line CX motor with 500 Wh battery integrated into the downtube. In testing, we've found Bosch's E-MTB mode works very well, offering a quick and hearty kick when you need to accelerate quickly, but gentle assistance in tricky sections. The lower travel stopped the bike from bogging down in technical uphill rock gardens, making them easier to ride through, and the 160mm cranks also help to reduce pedal strikes so you can keep the power on. The agile handling and stable ride make it one of the easier e-bikes to adapt to, and one of the most versatile.

Seven batteries keep you powered without adding much bulk to the bike. These state-of-the-art lithium batteries are built to last up to 10 years. A single charge provides a range of 20 to 25 miles. It takes just 4 hours to reach full charge. The battery pack mounts to the frame and sits directly beneath the seat making it less noticeable. 300W motor with variable speed throttle provides powerful propulsion to achieve a speed of up to 20 mph.
The Espin is powered by a 350-watt motor that’s rated for trips up to 50 miles (depending on the terrain and assist level). Once depleted, the battery fully charges in roughly five hours. Thankfully, Espin makes it easy to remove the battery, allowing you to quickly recharge it at home or in the office between trips. A backlit LCD control hub displays your basic metrics and battery life while in transit and LED headlights add a touch of light when needed.

their other models may have the same issue … This model comes to mind https://www.walmart.com/ip/ANCHEER-Folding-Electric-Mountain-Bike-with-20-Inch-Wheel-Large-Capacity-Lithium-Ion-Battery-36V-250W-Premium-Full-Suspension-and-Shimano-Gear/250514812?wmlspartner=wlpa&selectedSellerId=10813&adid=22222222227128420528&wl0=&wl1=g&wl2=c&wl3=235191079813&wl4=pla-578827040352&wl5=9012089&wl6=&wl7=&wl8=&wl9=pla&wl10=117084435&wl11=online&wl12=250514812&wl13=&veh=sem
One of the primary purposes of an e-bike is transferring power from the motor to the drivetrain to "support" your regular pedal stroke. All of the different drive units do this in relatively the same way, although subtle differences in their power output make them all feel slightly different. It is important to note that all of these systems work pretty well; the differences between them are relatively subtle but noticeable. We tested this metric primarily based on feel, as opposed to any sort of scientific measurement, and our testers could all notice the differences between the various models. All of the e-bikes we tested have several support modes offering varying levels of pedal assist support.

I continued to have issues with the rear brakes. The rear disc brake was bending when I braked and I could not figure out how to get it from rubbing on the pads. I eventually took the bike over to REI and paid for a tune-up. Fantastic work by them, the bike has a better top speed by a couple mph now and shifting/braking are much smoother. I was also having issues with the chain jumping off the front derailleur on high torque (high gear from standstill). Looks like I just needed the experts to give it the tune.
EThe Best in Test and Best Value Electric Mountain Bike tips do not result from the sum of star ratings, but by the assessment of the entire test team, taking into account the overall concept of the bike. It would be methodologically wrong to only add up the star ratings to make a final judgment in a scoring system – saying that something is “good” will not help anyone if they don’t know what it is for and for whom it is “good.” For this reason, we give a clear recommendation in every test result for which type of rider and purpose the bike is suitable and which not. The bikes themselves are as individual as the riders are – we just want to provide you with all the information you need to make a well-informed decision before buying. Here’s to long-lasting fun! 
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