"so many have the OTB Abyss and I wonder how they compare to Chota Q Trekkers. Looks like the OTB drain much better and the sole looks like it might have better grip on terrain."

Yup;
The OTB boots do drain much better and dry fairly quickly - I never was able to really dry out the Q-trekkers - the leather upper just stayed slimy (and stunk);  the sole on the Q-trekkers is a poor design in my opinion - poor traction in the mud, as compared to the 1/4" lugs on the OTB Abyss boots I have which really grip.  I have several different water shoes similar to the Techamphibians someone posted a pic of, a couple of different pairs of "wading boots", one pair of 2 pairs of the Abyss boots, and one pair of the Q-trekkers (which I have referred to in the past as a 39 dollar pair of shoes with a 100 dollar price tag due to very poor construction on the pair I have) - of all those boots, the Q-treekers are the least likely to ever see Quetico.  I know some people who have 20 year old Q-trekkers and swear by them, but mine (@ 2005) were junk.
So far, I'm very pleased with teh OTB boots.  I do occasionally use the Q-trekkers on local river trips where there are no portages, and I can keep my feet dry - they do OK as hikers in the desert terrain here.