Well, Noel is more interested in Yeul. It shows throughout the game and there's even Yeul's vision near the endgame. There's not much to be seen. Yeul and Noel are on a field full of flowers, they running towards each other and start to hug. Yeul is very happy to see this vision, so they might have a crush on each other.
But I agree, I can't understand what Serah sees in him. I started to believe the attraction to Snow is more physical, than emotional. Even though there's this life trigger event, where serah starts to talk of Snow's "awesomeness". The game even does a fast forward, because it takes so long. Snow is way to hotheaded and careless, I doubt that relationship will end well. Ignoring the ending sequence.