I kind of like the spoke holder on my bike, since it is already there and adds only very minimal weight. Granted there are plenty of other places to store spares though. Kickstands on the other hand I have pretty much no use for. In the few places I don't have somewhere to lean my bike I just lay it on the panniers.

My observation is that bikes on a kickstand are actually more likely to blow over. The majority of the times that I have seen bikes blow over it has been ones on those two legged stands. That and the extra weight of the stand are enough to make me not want one.