yes, R6 is much better on obbies and parkour. The hitboxes are more fair, reliable, and just better. While it might not show very much on easier obbies, the harder ones are alot easier with r6. If its any type of jump than needd to use shiftlock, r6 is better.
And some of the reslly hard obbies require you to dp glitches like wallhop, frogop, e dance glitch, stick glitch, etc