I don't think your friend is a "complete idiot" for not going out listening. He can buy reputable speakers, listen for a while, and if they're not to his taste, sell them and buy different reputable speakers. It'll cost more money that way, but it'll save time and effort going into audition rooms that are, very likely, much different from his own room. Going out listening is not the holy grail that some people here make it out to be. Read reviews, check measurement numbers, and read what other people's opinions would give you a good indicator of what you should be bringing home and listen in your own room.
As for those two brands, I'd vote for Monitor Audio RX6, which is smaller than RX8. I've heard that RX8 could have too much bass.