It normally has noticeably better imaging from my experience, I had to build a player by myself to match it (I don’t know if there already were players that do that, I didn’t find any and so many people I know)
Iirc the tubes on the radiators should always be at the top
This was more of a “do you generally prefer speakers with covers or not?”. If you like them like they are choose the second option, if you’d prefer to have a cover choose the first one