I'de go with Misa... Menmei turned into a totaly self centered brat in both DYRL and the TV. Granted alot of that in the TV show the result of her rappid rise to fame. In DYRL, it seems to just have been an inherant personality trait. In both versions though, Misa actualy opens up and becomes, I think, a better person. If you look at what Hikaru has in common with either love interest in the long run of the show, its pretty plain to see Misa would be the winner in either case. Minmei made sence when Hikaru was still young and enexprieanced, but in the TV show, by the time Hikaru, Misa and Co. return from the spy mission that takes them to meet Boldoza, its pretty clear that Hikaru has matured far beyond the need to be seeing a girl like Minmei.
As for Kaifun- in the TV show, I like the way he spirals into alcoholism and depression there towards the end. I'de rather be able to say "Sucks to be you jacka**!" than let him end in a "tragic accident" and in DYRL, he had like what? 10 lines? After the return to Macross, I don't even remember him being in the rest of the film. Also, he didn't seem like so much a jerk, as just the way a manager would be acting. either way he fades into obscurity, so i'de let that play out as normal