Those appear to all be internet bikes. In southern Ca you might be able to get into a shop and try something on for size. One size does not fit all, especially not my short legs. You may be normal size. In my tiny 2 million metropolis, there is only Pedego over in the next state 9 miles away, and they are not inexpensive. Pedego apparently are reliable to count the number of known problems in the brand threads. But not very sophisticated. I'd like to try a giant/yamaha torque sensing bike sometimes, but I'd have to ride Greyhound to Chicago (aurora actually) to do that.
Derailleurs don't have to be a maintenance hassle. The sram shifters, and the real steel cables that came on my bike, means I don't have to adjust the derailleur all the time. In fact, never in 3.5 years and 6500 miles. One front stop screw I fiddle with. Whereas the kiddie grade MTB's I was riding previously, yeah, fiddling around all the time with shifters & derailleurs. Cheap cables stretch. I ride a yubabike, not cheap, and apparently the parts aren't either. I do shift 2 or 3 times out of every stop sign or light. I do oil the chain & all steel moving parts every 2 weeks, it rains a lot here. I never clean the chain unless I tangle up string or grass stems in the sprocket cluster or takeup. Chain lasts 5000 miles, 2 1/2 years, with a hub motor and me pedaling unpowered most of the time.
Are you going to call a spouse or tow truck when you get a flat? What if a fender or strut falls off, or the seat slips loose & points up? Are you ever going to stop on the road for a cold or hot drink? Is someone going to watch your bike for you?
I carry a 6' SS sling & lock in the pannier bag you see, plus about 7 lb of tools to handle flats or nearly anything else but chain or electrical problems out on the road. Plus 3 tubes, one jointed. Some places I go don't have cell phone service, and my working spouse's car is too small for bicycles. Look at those frames and decide where to put security gear and maybe some tools. Before you buy. People in huge cities encounter a lot of tethers suitable for U-locks, but there is nothing like that here. I secure to power poles, gas meters, electrical conduits, cart racks. Besides U-locks are a formula that the pro bike thieves can cut off in 3 minutes with their battery grinders. My stainless steel 3/8" sling up in the air has bamboozled potential thieves for 3 1/4 years. I shop work & even eat off my bike, it sits alone locked up several times a week. Bike sat behind a Mexican restaurant last week for 40 minutes. 40 minutes outside a grocery yesterday, 10 minutes at a mini-mart today.
Yes, 20 miles should not be a problem. Happy shopping & later riding.
