Thank you CenCalArt! Is that the same as Mexicola Grande or is Mexicola a different variety than Mexicola Grande? Hope so, I'd like to try to dwarf an avo in a 25 - 30 gal pot, at least for quite a while. The Grandes look huge and out of control.
Have you tasted any of the others?
Mexicola and Mexicola Grande are definitely different, but both taste very good. They want to be in the ground, though, and both become large trees if not aggressively pruned. You will not likely find any avocado (even Wurtz) that really will be happy in a container. Avocado trees have both deep taproots and wide/shallow feeder roots, and do not take kindly to being contained in even a large pot for very long.
In terms of fruit quality of cold-hardy cultivars, I can eliminate Aravaipa for you, which is somewhat bland (not terrible, just boring). I might finally get to taste Duke and Joey this year (both are about to start flowering in my greenhouse), but they will be a better size to hold fruit next year, so I'm not holding my breath. I've heard Duke is good eating quality, but some people complain about "off" tastes for Joey. Most of my other trees flowering this spring will be too small to hold any fruit.
The mexicolas are very vigorous trees. Really only a few varieties are suitable to grow in pots. I think Wurtz gets the nod, but really avos like being in the ground.
Fuerte and Bacon can be great if picked ripe, and their seasons do complement Hass well, but for cold hardiness, you should consider mostly Mexican types with seasons Dec-February, ones like Fuerte and Mexicola would be prime contenders.
Mexicola ripens Sept-Nov, not Dec-Feb, at least in northern CA. Most of the purely Mexican types are short-season (fall-ripening), whereas the winter-ripening types (Fuerte, Bacon) are generally Guatemalan/Mexican hybrids.