As with others who've stated their love for both characters, I, too, am torn. However, I voted for Bev. Troi's sexiness is always on, as it were, besides which, her job is too specialised. Most of the crew probably have never gone to her, for anything. Sooner or later, though, you're going to have to see the lovely Doctor Crusher whose empathy for her patients, along with her skill, makes her the best physician in Starfleet. I love how smirky she is, I like her sense of humour.
Troi's sweet, but she does seem a bit pretentious. Like she's faking a smile, because it's expected of her, to keep the status quo, when in fact, she couldn't give two shits less what you're on about. Crusher has no such airs ... her concern for the welfare of her patients comes across as very genuine. She really cares and she'll go beyond the cause to keep you going. She even revived 3 frozen, dead bodies, instead of leaving them in stasis, when Data discovered them and had them sent to the morgue. She's for Life and can't be any other way about it ... it's just too damned important to her. I love that about her, I truly do. Bring on Bev, I say ...