Goose language? Or yankee doodels?
I was taught British English. I think America English is in many ways simpler, but my brain is wired to british spelling as well as pronounciation for the most part. Now it depends who has good spoken british english. One of my all-time favourites is Rowan Atkinson, but his english is kind of more theater-trained really; if you compare it to the Monty Python guys for instance. War criminal Tony Blair also has a good spoken english - not that I like the guy or find anything useful he said or did, but british english wins. Or we could go scottish - I don't quite like it as much as british english (Patrick Stewart also has a good intonation, but it's also more theater-trained than "real", per se), but one of the coolest thing ever is Gerard Butler teaching people scottish. What keeps scots apart from English is the language really. (Though, I also have to say, Sean Connery's dialect was nowhere near as funny or entertaining as Gerard's dialect. Guess even in Scotland there are diffferences.)
Irish english sounds more melodic - no wonder they kept on winning Eurovision. Paul David Hewson's voice in his prime is a great example.
I've also found African American english very interesting. One thing that keeps on tripping me up is "asking" versus "axsking". To me only the british pronounciation works, but I hear sooooo many axxing examples on youtube that I concluded that this must be widespread in the USA. I always have to think of an axe when I hear it though.
This has missed the Atlantic Canadian Cape Breton dialect, which if you listen to some age 70+ people who've lived their whole lives in the Sydney, NS area is significantly distinct from Halifax or other areas in the south/southwest of Nova Scotia.
This page/project itself is another proof of the cultural significance of YT, one of the very few positive things brought by the Internet post-2010.
I feel that the Maritimes are somewhat simplified here, especially Newfoundland and Labrador which has some of the most distinctive accents on the continent, at least among older people.
These are fun relevant videos:
Accent Expert Gives a Tour of U.S. Accents - (Part One) | WIRED https://www.youtube.com/watch?v=H1KP4ztKK0A&t=271s