This is a forum where people give their
OPINIONS. 
When someone asks "which robot is best" they are asking for your opinion. Since not all the robots have had matches against one another there is no definitive proof either way.
And before someone says "scouting" for proof. Scouting is the scouter's "
interpretation" of how effective the robot is, and only against specific opponents. Thus scouting is only empirical data, which could be flawed.
TBH, when you ask for an opinion, you should get an opinion. When you ask for facts, make sure those facts can be backed up by real (and not interpreted) data.