Do you think Ted loved Robin or Tracy more?
It is implied that before he meets Tracy, he hasn't met "the one" yet. Klaus's speech about "Lebenslanger-Schicksalsschatz" and how Ted hasn't met her yet if he has to think about the answer imply that at that time, he hadn't met the one he truly, truly would love, which implies that that only happens when he meets the mother and thus he loves the mother more than he ever loved Robin.
But if he loved the mother more, why is ending up with Robin a happy ending? The one he really loved died and he's basically having to settle for second place because she's still alive.
I just really like the alternate ending more. It makes so much more sense. It isn't an AMAZING ending to the show, but at least it finishes the story off in a way that doesn't make me feel like the entire time I was watching it was a waste.