i'm looking to try a carto + tank combo on my MVP (when i get it in on tuesday

) i just have a few questions:
1) what tank seems to have a pretty solid build?
2)do cartos make a lot of vapor?
3)is it on par to lets say a protank or iClear?
4)and why do you prefer carto/tank setups?
I took the liberty of numbering your questions. Be aware that (like most things) everyone's own personal tastes and experiences will vary and that folks are (typically) of the opinion that "what works best for me should work best for everyone else". I'm even guilty of that myself, but can usually catch myself when I am doing it. Usually.
1) The IBTanked tanks are some of the most consistently recommended and highly praised tanks out there. Even without any sort of flange or lock, they are famous for having a firm grip and solid seals to the carto and as a result, are very resistant to leaking and messy "pull out" incidents. There are tanks that are both cheaper and more expensive. Some have fill features that are clever designs, some have metal cages around the tank, and it's possible to "test out" carto-tanks inexpensively to see if they are "right for you". I personally bought a double-handful of the Smok Pyrex DCTs and have determined that carto-tanks are going to be my delivery system of choice. But because I went with the low-budget tanks (they're essentially disposable since the ends are not removable and the seals/rings are not replaceable) I will end up replacing them (with IBT's I suspect) when they fail. That is a when, not an if. They will wear out, sooner or later.
2) Carto's "CAN" make a lot of vapor, but they can also run dry, get flooded, or underperform. When they are running well, they can be exceptional. A carto that "runs well" is due to finding a brand, type, number of coils, number of holes, resistance, and voltage/wattage that suits the liquid, user and their vaping style. It's not hard to "go basic" and get satisfactory performance, but with a little trial-and-error, it is possible to tweak the variables and obtain exceptional performance.
3) That's a tricky one and where personal experience, preference and "what I like is probably what others will like" comes into play. I know of plenty of members who have shared their experiences and clearly prefer clearos over cartos, and probably just as many who feel the opposite. I will say that if either is setup well, they both have the capability to impress and please the operator. How's that for being non-committal?
4) I like cartos (both tanked and untanked) due to their simplicity and (for me) how they don't necessarily require any twiddling, fiddling or adjustment, unless you WANT to tweak them. Essentially a carto-tank is just a carto that auto-fills from a reservoir. So as someone who is fine with a properly filled carto on an eGo, a well-primed carto in a tank is (for me) "more of the same with longer times between top offs". Sure, seeing your liquid slosh around inside of a pyrex tank is eye-pleasing, but I just like being able to easily switch between about 6 or so pre-filled and primed tanks as my tastes change throughout the day and know that whichever tank I spin onto my mod, I am going to get a vape that I like without having to do anything but press the fire button.