Mains fed shower, or one running from a tank with a pump or similar, we have the former, has a maximum rating of ‘awesome’ or ‘excellent’, and is often at that level.
Whenever I’ve stayed anywhere that has a tank fed system (talking domestic here….), it’s always been a question of limiting the time in the shower, the amount of people who can have a shower one after the other or having to wait ages in between showers for the water in the tank to heat back up.
I’d want electric or feed from a combi, I reckon…..
I think the shower head fitted can make a big difference to the ‘feel’ of an electric shower. We bought a new showerhead for our Triton one (can’t remember why) and it made it much more ‘useable’ as the jet pattern seems to suit the water flow better.