My partner (somewhat handicapped, very slow walker) and I have travelled quite extensively in Western Europe but never been to either Bulgaria or Romania, and are thinking of plugging this gap during November 2021. Which city, Bucharest or Sofia do you suggest we visit (we are most likely to have time for only one)? Other than general sightseeing, we like sampling local food & wine and exploring places using public transport (preferably trams). Other than the main capital city we would like to explore other worthwhile locations in the country, using either trains or a rental car (if local driving conditions do not present a hazard of their own). Not interested in shopping or 'entertainment' at all.

Which place(s) would you recommend?