Totally Elora. Of all the girls Spyro's ever met, she's the only person who ever did anything nice for him without having an ulterior motive.
Elora:
* felt bad for dragging Spyro into her problems
* helped him at every opportunity
* kissed him
* rode the love boat ride with him
* was originally designed to be his love interest
* gave him a second chance at the end of YotD
* didn't stalk him mercilessly
* gives him his space
Ember
* talked to him twice
* dumped him for Bandit in SL
Cynder
* tried to kill him at least three times
* betrayed him at least once, maybe twice
* only follows him because she has no choice in DotD
* runs away from him in TEN
* acts generally confused and uncomfortable
* seems to only "love" him for personal reasons
But, like with all things in fandom, the only pairing anyone will like is the their favorite. Personally, the Spyro pairing wars are pointless because all three of these ladies exist in different universes anyway. Elora wouldn't be interested in LoS Spyro, nor would Ember be overly infatuated with Insomniac Spyro, etc.
I always vote for Elora/Spyro because a) it was the first Spyro pairing, b) it's the most interesting (you can get two dragons together any day, but how often do you see a faun with a dragon, eh?), and c) I've yet to meet an obnoxious Elora fan, whereas there are several pushy Ember fans and don't even get me started on the Cyndorks.
Don't forget that Elora is the only one out of the three to kiss him.
IMHO, the fans of Cynder and SpyroxCynder are the worst. Only about 10% (possibly 15%) of the fandom are mature, regular fans, while the 90% are immature, drooling mutts.
..... You don't want to know how much SpyroxCynder porn I've seen....