I tried lots of pedals because i did not want a digital octave.
I gave up and settled on the Pog. The tracking is fast and does not glitch.
It manages polyphonic tracking and the sub octave sounds a bit strange when soloed, but as soon as a little dry signal comes in it really comes together. The upper octave is a bit harsh when you use too much. When you dial it back to the sweetspot the sound gets huge. The only downside is that the upper octave really starts showing when you play above the 12th fret.
The Sub is so tight and direct, it does not feel like an analog synth and has none of that sloppy lagging feeling of some analog pedals.