Bikes from RadPower cost more because they offer customer service that may be available in-person if you live in certain area.
The additional cost is not worth while if the in-person service cannot be offered in your area.
Lectric may not have the same customer service available, but their bikes are better spec'ed and cost much less.
If you can find shops that help you service your Lectric ebikes, then you don't need the service that Rad Power offer.
More than likely the issues you may encounter with ebikes do not need a ebike shop to complete.
With some minor tools & mechanical knowledge, you can do most of the maintenance an ebike need.
Specific motor or firmware related issues, they don't occur all that often, warranty usually could cover those.
Whichever you decide, you need to like the bike you buy.