Octavers are certainly a tricky territory. But the best thing to do is to try out an OC-2 and a Micro POG, since they're at opposite ends of the tonal spectrum, and see which is closer to what you're looking for. If you're happy with neither, your experience can guide you to the ideal choice.
Lots of people complain about tracking issues with octave pedals, but the reality is that no analog octave pedal fares well on the "E" string and below. To be fair, most people won't be playing that low with an octave pedal anyway... and if you are, it's not going to be very audible.
People will claim that some pedals can track an open "E", but any decent octaver can produce the sub-octave note. The real problem is
sustaining it, and no analog octaver I've used can do that particularly well on the lowest notes without getting a little chaotic. Good technique works wonders, but you're still at the mercy of the pedal if you're trying to sustain the note for more than a quick "thump."
Also, it's my understanding that tracking is supposed to be specific to digital pedals, but it seems to get misapplied to analog pedals. Someone correct me if I'm wrong on that. But while I'm at it... the Whammy has notoriously poor chord tracking - it's best for cleanly played single notes. But IMO, that's part of its charm. You'd have to play with one to see what I mean.
I'm a fan of that "dirty digital" sound.
