I have never heard of either? and the first weighs nearly 28 kg....Hardly a brilliant recipe for a bad back.
Try before you buy is the best idea. nothing wrong with a step through they are very practical so no need to feel embarrassed....
I'm pretty certain both makes and models have had a mention in these pages Ed before now. I can't remember how they were perceived though!
Presumably, Neil, (the OP) is going to ride the bike and not carry it so 28Kgs isn't exactly unmanageable. Lots of ebikes out there weigh in at around that figure, some heavier! Lighter machines, I grant you, are desirable for a variety of reasons but as one might expect, there's a premium to be paid usually for that reduced weight.
As for step-thru bikes, I agree entirely with Ed. Ok, no-one's ever won the Tour de France yet on one but most of us ain't ever likely to get any closer to that kind of action than our TV screen. I've been riding a step-thru for a couple of years now and no-one's ever called me a cissy.
One word of caution though; don't come to a stop on a step-thru, put a foot down and delve into a pocket for a handkerchief, letting go of the bars so you can blow your nose holding the handky in both hands. You can do that on a gent's bike as the crossbar rests steadily against your thigh but.....you get my drift.
Neil, set your budget; stick to it and as Ed suggests, test as many bikes as you have opportunity to do within that price limit. You don't have to spend a fortune to enjoy the powered assistance that makes cycling a possibility for those of us with physical limitations. You'll find one you like; one that suits you. It may not be the same bike that Eddieo, Funkylyn, Tillson or other regular contributors might select but none of us is the same shape, weight and so on. Our individual needs differ and there isn't really a one-size-fits-all bike out there.....well, not one that I know of.
Enjoy the search,
Indalo