Well a bit about what I know about Tesla, I have the steampunk and it was my tester RTA builder, and it's all metal. I leaked LIBERALLY through it on multiple occasions. Like, all over it and through the 510 pin and everywhere else. It was FINE. And, I am going to say, like the equivalent of 4.5 mls sometimes. HOWEVER, I've also had slow leaks that I didn't notice and when I removed the batteries, they were all coated it eliquid. It never stopped working, it never shorted, and I guess I am WAY lucky, but I'm also extraordinarily happy that doesn't happen anymore but my steampunk refused to die, or even complain. I also like Teslacigs board, honestly, I consider it to be one of the more efficient boards that isn't a DNA. It tends to read a bit on the high side, and it also tends to convert power efficiently. The steampunk has an on off switch which I love. It only goes to 120 watts and it's Rather Heavy if those are concerns. With that said, teslacigs makes a ton of products, in various forms, including the oh so ugly (to me) Tesla Wye which performs like a champ for those who can deal with its looks. Don't get the dual battery PUNK (yeah, it's a different mod than the steampunk) that model seems to be designed for the self injurers among us, who wish to bleed while we vape. Seriously it is HEAVY and boxy and sharp. I think I vaped it five times before selling it to a dude who hopefully doesn't hate me now.
The zenith is a really nice MTL tank. It's got coil options 1.6 and 0.8 and 0.5 now I hear with the mesh coils, which I don't much care for honestly, I haven't heard the greatest things about the mesh or I have heard inconsistent things about the mesh. It might be the first MTL mesh coil, AFAIK but I actually prefer the 1.6 which is odd, but the Zenith (IMHO) doesn't have quite the airflow to run it at the wattage I would like and etc. It's variable air, but it's not that MUCH air. The 1.6 coil has a break in period of about a tank. Coil life on both of these is stellar, provided you don't over wattage it. IDK, I don't find the 0.8 to be THAT different from the 1. 6 coil but I am not raising the wattage ENOUGH to like, get what I want from it.
You would need to want to MTL vape.. IN your situation where you need durable equipment and long lasting coils, the zenith is the best choice. It's sturdy. Flavor is good. You will be able to (probably ) figure out what coils you want if you try both that come in the tank, (if you just give each one a few days, decide and order the coils you like) because they will remain viable long enough for you to obtain them, probably. It's an easy to setup, nice topfill, and definitely a solid performer with 4 ml capacity and good flavor.
If you want to go with clouds of vapor I am not your gal, but that is my input on what has been recommended. Etc.
Good luck,
Anna
