I personally prefer Cartos to clearos, hands down. Every clearo I've had either muted the flavor substantially and/or gurgling/dry hit me to death. The Protank 2 is the only thing similar that was any good for me and I love it. It's also great because you can replace or even rebuild the heads. (since I see you have one of these already, I HIGHLY recommend the Airflow Attachment. it'll turn your Protank 2 into a whole other world of awesome)
Cartos are great, to me. Some people don't like them... but I think they are super convenient when you're on the go. There is little to no tweaking that is needed, unlike any other attachment you may have, out and about.
Dripping, I think everyone would agree, would be the best with flavor because there is less "medium" between you and the coil. It's pretty much direct. How well that flavor is depends on many things, though. The wick used, the coil, the device, the wattage/voltage, the juice... A lot of factors. Dripping is ok but definitely not my preferred method because I'm lazy and want instant gratification.
Tanks are ok but are finicky too. By tanks, I mean the rebuildables, such as the Kayfun, Taifun, etc. They can be great, but again it depends on all the factors displayed for the "drippers" and some additional factors such as air flow, tank construction.... Again, something that takes a lot of fiddling. I do like my Taifun clone though. It's nice to have variety.
All of these are based on my opinion and experience of course. TO give more information about how I vape, I tend to like 50% VG or higher, so more on the "thick" end. Throat hit makes no difference to me. I like clouds but am not a cloud-chaser. I am a flavor chaser... All about the flavor. Good luck to you.