I always prefered Tomoyo loving Sakura. If CLAMP were aiming to show the feelings of unconditional love then in my opinion, the story of Tomoyo would be the story to look at.
I never liked pairing her with Eriol as it made it seem like she was too willing to turn her back on Sakura. They way I see it, even when Sakura and Syaoran got together, Tomoyo would always Love Sakura unconditionaly, just as her mother always loved Sakura's mother.