To summarize whats there, I'm now using a combination of Kania and tube traps.
So far this year I have not put out the tube traps yet, I have been catching a lot in the Kania traps (3 yesterday alone for example). One reason why I think I am doing better with the Kania traps this year is I switched to peanut butter bait, the bait I was using in the tube traps. I push the PB through the grate in the Kania trap so its dripping down. The squirrels can't resist pawing at that.
Overall I would say the tube traps are probably better because they are portable - move them to the hot spot. But I like how the Kania traps are up all year, no need to do anything to them other than set them when needed. The tube traps also need to be maintained, the U always is getting out of alignment. A common problem with them is they stop firing for people, I think its related to this U getting bent.