As I'm looking for a new ebike now I've sold my Focus Thron I'm looking at a hardtail bike......I've looked at Ktm,Haibike,Cube etc of coarse there all different depending on spec and price and it is really how you feel riding them and not forgetting aftercare,but apart from all that what make one manufacturer better than the other.????
Sorry to take the thread of topic.
You've basically, listed - spec, price, ride quality, and aftercare.
These are pretty much the 4 key things that will set bikes apart, other things that come into play with higher end bikes, and eBikes include.
customer service before and during the sale (its not just aftercare that can influence a choice) dealer knowledge and support, availability, warranty, resale value.... I'm sure I could list more, but I've not had a coffee yet.
and then it comes down to things as simple as colour. KTM for instance might make the perfect MTB eBike for you, but if its in a colour you don't like, you're not going to buy it.