I prefer the T2 because it's easier to maintain then the T3 and the warmer vape. The downside is keeping the wicks wet but no leaking issues.
I also have some T3's. The one major issue I have with them is adding more liquid. Sometimes
juice comes out of the mouthpiece when the bottom is taken off to refill. The leaking stops after replacing the bottom but then it gurgles. It seems that
juice that collects around the bottom coil runs into the airtube when it's turned upside down. It worked good with the initial fill, but not so good after adding more
juice. Maybe I don't have the correct technique when refilling but for me, the T2 is less problematic.
In fairness, the flavor and vapor production is good with both.