I've never found OC2s to be glitchy, unless your playing isn't very clean... If you're not ending your notes before you hit the next one you won't get clean tracking.
I used to think most synth pedals were bad at tracking when I first got my Future Impact, but I soon realised it wasn't the pedal, it was simply revealing how untidy my playing was back then. Now I never have any issues with octavers/synths etc.
But to answer your question, I would recommend:
OC2 if you want a unique synth/sub-like tone.
MXR Deluxe for an all-round go-to octaver that can do it all.
3Leaf if you've got the $$$