Oops! Missed this post - sorry for the delay
@gurgler >.<
I've used all sorts of pots, and i don't have a favourite as such, but didn't like using the airpots too much! It's a bit messy for me. I only really use the solid plastic pots now.
I've traditionally used 11 litres or less in size pots, square have been convenient for me, but the round ones are just as good.
Watering to run off is a good idea so have some drip trays ready and little feet for your pots so you dont have the roots sat in the run off water.
It's good practice - although not essential if you feed the right feed at the right time - the leaves will get ugly, but the plants grow fine. I say this as i've done a really bad condition grow (bad watering, bad temps) that was ultra time limited. Spent less than 3 hours with the plants over the whole grow. Never watered to run off, - didn't check the ec once, and only had a rough idea of ph as didn't test that either, got a good haul. (i partly put this down to the slightly more expensive canna coco pro medium, but patly down to cannanis plants being awesome and tough - and decent genetics (sweet trainwreck & mephisto white triangle)
But if you've got time, i'd stick to the rules! ^_^
Hope this late info helps, or your coco grow is going well!