Steve
Mostly Harmless
Hold on. We seem to be getting back into the realm of debating unicorns and faeries. Aren't we?That's just one of the reasons I believe top position is superior combatively. It's also better for striking and for being able to potentially disengage if necessary. However if you are only concerned with competition under certain restrictive rulesets, then the bottom of guard can be equal or even advantageous.
I tell my students that for competition they can develop whatever game works for them under the rules. But for fighting, if the fight goes to the ground you want to be on top. The guard is just our backup plan to try equalizing the situation if we do end up on the bottom.