I have the following tanks listed in order of purchase: Kanger Evod tanks Innokin iclear 16 Davide BDC Kanger AeroTank iclear 30S Boge F16 Carto Tank Smok Pyrex Glass DCT Aspire Nautilus Kanger Evod tanks (not genuine) Started with a knock off pair of Kanger Evods. Was ok at the time because I hadn't tried anything else. However, with time, I realized they were the most consistently poor tanks. Leaking, gurgling, getting ejuice in your mouth, dry hits, etc. I tried several things before giving up on them and getting iclear 16. I tried replacing the coils with genuine kanger coils, different resistances, different batteries, just not good at all. Innokin iclear 16 Much better than the evod tanks. Inconsistent airflow, sometimes loose, sometimes tight. Odd burnt or dry hit (doesn't happen too often). Flavor and vapor is pretty good for the most part. Sometimes the vapor comes out really hot. Easy to clean. Overall, a huge improvement over the evods. I have five of these because they came with my innokin itaste v3, and I use them for sampling new flavors. Davide BDC Nice quality bottom dual coil tank. Very rare floods, gurgling. Low maintenance. Easy to clean. Coils are fairly priced (Can use aspire BDC coils). BTW, I tried buying the AeroTank bottom, and replaced it's coil with the Davide coil to add airflow control to this tank, it works, but not great. I ended up putting it back the way it was. Reson? I ended up having to leave the airflow almost completely open all the time to still get less than desired airflow. Also, I had to not tighten the coil all the way in, so that it doesn't push the bottom pin out too much, resulting in not being able to screw the tank all the way down on the provari. Kanger AeroTank Awesome tank! No floods, no gurgling / leaking. Airflow control. Nice looking, quality tank. iclear 30S Liked it at first. Nice vapor production. However, getting ready to retire it due to: metallic taste, hard or not possible to clean the coils, replacement coils are expensive, no airflow control. Another issue I had with this tank is when I tried changing flavors. With the AeroTank and Davide, I would just vape it till it got empty, and put in my next flavor. I would get a few mixed / overlapping hits, and then eventually the new flavor would take over. With the iclear 30s, I tried doing the same thing, and the previous flavor just would not go away. I even washed the coil and dried it off with a blow dryer twice. The taste went away, but still hints of it remaining. Build quality and looks are pretty good. Boge F16, and Smok Pyrex DCT These are carto tanks, and pretty much as good as the cartos you put in them. If using flanged cartos, they both have the recessed bottom so they sit flat inside. While the Boge recess is round, the Smok is kind of rectangular so the carto can kind of lock in. I like that the F16 is clear, but it's plastic so you have to watch out for tank cracking liquids. The Smok is glass so you don't have to worry about that. On my Provari, especially with the Smok tank, airflow can get fully blocked when fully tightened. To work around this, you either have to loosen the tank from the apv, which may cause a weak connection. Alternatively you could slide the tank up slightly, but in the case of the Smok, it defeats the purpose of the carto locking into the recess. One more option is to get an airflow adapter, which I did, but I didn't like that too much either (Smok airflow adapter). However, I have a Hippo airflow adapter on the way, and that will probably do the job well. What I would be looking for in my next carto tank is top fill hole which won't interfere with driptips (easier to fill the tank right to the top), glass tank, and 23mm width to fit nice on my Provari. Which tank is that going to be? For me, the GP SnP tank. If you haven't already, check out PBusardo's video review of this tank. I think it is just perfect in every way, especially for a Provari. Too bad it's out of stock most of the time though. Aspire Nautilus My latest and favorite tank. Flavor, vapor production, airflow control, looks on Provari... all just outstanding. This, the aerotank, and the F16 are the ones getting the most use from me right now. I'm still using all my tanks so I can have them loaded with different flavors. However, my favorites are the AeroTank, and the Nautilus. More about the Nautilus.... this thing is frickin huge! Has a nostalgic vacuum tube look to it (if you like that), and it's wide enough to give the straight look on a Provari with a ring. The AeroTank looks good on the provari also (without a ring), and it can look decent on standard Kanger or innokin itaste v3 batteries also. I think the Nautilus, would just look ridiculous on a smaller battery though. Having said all the above, if I had no tanks and was buying just two right now, they would be the AeroTank, and the Nautilus (or maybe just 2 Nautilus). Hope this info helps some of you. Let me know if you have any specific questions about anything mentioned here. Cheers!