Ok my bit.
I think an important question is where do you want the electric motor to be. There are 3 opions.
In the front wheel; I think these are cheap an nast an would avoid.
In the rear wheel; found on a wide range of mid priced and more expensive sportier Road Bikes ( a Road Bike is a racing bike with bdrop handlebars , narrow saddle, "crouched" riding position) the nice thing about E Road Bikes is often they don't look like E bikes, good ones are expensive £5k etc.
A mid mounted motor, where the pedals are: a good option that are found on usual better and more expensive E bikes often aimed at the Leisure market, usually more of a flat handle bar communter style of bike, good one are not cheap. There are also fancy and expensive off road bike with lots of suspension with this set up that can cost a lot.
A final thought woulld be, actually finding somewhere that has stock could be a real issue. The Covid bike boom has empted the warehouses. I hope that hasn't put you off, any sort of bike is still the best way around!