I think the actual riding the bike is great.
For commuting I would choose a hub motor - less wear on chainline and more relaxing
I would say don't spend a lot of money (unless you want to). A lot of the things that makes bikes expensive are pretty irrelevant to e-bikes
The extra weight doesn't really matter with motor assist, just taking out and putting away
You use the gears much less, so a slick gear change and lots of gears isn't as important. In fact more than 7, 8 or 9 gears is probably a disadvantage
I would say if you are doing a lot of miles is choose disc brakes and if cable, upgrade to hydraulic (cheap and easy) . My first bike had rim brakes and I had to adjust them quite often.
The other thing is the security at the other end - if you could only take a folding bike into work, that would tip me into buying a folding bike for a commute. Also if you are going to leave it outside buy a waterproof cover !
https://www.ebay.co.uk/itm/405206837770?