To me red base seems more vulnerable. Left side of top route is easier to move around (and therefore increases your chances of surviving there), flag spot is easier to access and easier to escape by nade-boosting straight up. Left half of the middle route is more straight and is easier for blue to snipe/spray.
Although on the other hand.. middle route is better protected on the blue side, but that also makes it harder for blues to defend it.
Gah, it's really hard to tell whether this map is balanced or not. +_X But to be honest, I don't care. I play for fun, and I have lots of fun on this map.