Motul RBF 600 has a higher dry boiling point & is rated dot 4.
Motul DOT 5.1 is really DOT 4 and is polyglycol based. It has a higher wet & dry boiling point than standard DOT 4
The only two which should be used.
RBF 600 for the track only junkies (change frequently because moisture really decreases stopping power.)
Motul 5.1 for street and some track days no need to change it so much due to it's high wet boiling point.
From what I've seen, any other brake fluid is second rate. And DOT 5 is garbage for a motorcycle due to the quick temperature increase the rotors put out.
Oh, and if your using a mity-vac, go to Home Depot & get some new clear nylon tubing. They have tubing that fits perfectly over bleeders & it wont slip off (I don't remember the size). Making it a super fast one person bleeding experience.
RBF 600 Dry: 593.6 f
Wet: 420.8 f
Motul 5.1 Dry: 518 f
Wet: 365 f