I like both of them.
I prefer Rhydian because I think he is exceptional but I think the sustained criticism of Leon since the first live show is very undeserved. It was an awful arrangement of the most basic melody (as most Beatles songs are) but to translate that into "Leon can't sing" and for Simon to start the party by saying that he thought Leon may have taken the place of someone more talented when he had commented at Leon's audition (for at least the fourth time but for the first time this series) that a natural talent like Leon's was rare is a joke. Yes, the place of someone far more talented in that category was taken by someone who shouldn't be there but that comment should be aimed at Andy who got in on his perceived looks (he does nothing for me) when he was blatantly nowhere near as good as Dominic and the lovely looking blond boy whose name I can't remember.
Leon can obviously sing. Even my husband, for whom 'X Factor' is the equivalent of mogadon, was moved to comment the first week that Leon's vocals were good but the song arrangement was terrible. It was and an insult to Leon's ability.
I'm not going to deny that I want to Rhydian to win but I would love to see a Rhydian/Leon/Niki top 3 and whoever won out of those three, I wouldn't be totally disappointed.
I liked Futureproof as well but of the remaining acts, the only one I have any time for is Same Difference and that's just because they are entertaining, so enthusiastic and come across as such lovely people - plus, I think they actually have quite good voices individually, particularly Sarah.