Hmmmmn.... that's a really difficult question. Colour choice is very much a personal thing. Where I prefer the red border because it contrasts nicely with the overall blue-green of the map, another person might prefer not to have such a distracting bright colour around the otherwise relatively peaceful colours of the map.

Its the one question I really can't help you with - and which you could really do with having quite a few other opinions to answer.

What does the author think?