So, how many can we nominate? And what do you mean best? Which one I personally like the best?
Anyway.
Classic. I'm very fond of the boardgame so it is (and will be) my favourite map. I know it by heart, it's easy to understand and always great to play.
Crossword. First and probably... oh wait, definitely last nomination

It's not hard to understand if you actually read how territories are bordering and it's a great map to use on tournaments
Ireland. Just another great "classical" map. Very easy to understand and see all the troops and what borders what and so on. So just a nice map.