Obito never showed that speed of warping during his unmasked self. Kakashi buttraped this Obito in terms of CQC, and saw through his Genjutsu, and was portrayed the more powerful entity during that simulation.
Thus, Muu would shit on him, given his KCM avoiding levels of speed, invisibility, combos of the latter with Jinton or his blade, and radar sensing.
Masked Obito'd shit tho. BM Tier speeds, in addition to taking on 4 Kage Levels + his quicker than prepped Jinton warping speed. + he has them Chakra Rods and CQC speeds surpassing that of FTG Minato's. He's physically so quick that BM Naruto got vaped w/o Hatake's aid, and Kamui's kryptonite.
It could go mid diff if former decides to play around w/ his Kamui less arsenal although I don't see how he'd defeat the Mazo, and his reflexes in addition, when he could blindside him, while he's dealing with the energy shockwaves the statue exudes.
Tobi, low-mid diff.