I think it's a matter of location. Do you have time to drip, time to wick cotton, sometimes change cotton, carry a big bottle of juice around and an extra battery or 2? Or do you have a 5 minute break, and just need the quick and fast vape without all the mess that comes with dripping?
When I use a tank, I'm at work, driving, or playing video games, the tank becomes invaluable! Try driving an need to refill your RDA!! However, my only regret is getting a kanger subtank nano. It's a great little tank, juice lasts for a long time on 15W(almost all day at work), tastes good, not worried about clouds, but I'm not trying to impress anyone outside while I'm vaping, unfortunately leadership classified it as smoking, so we have to join the smokers outside. The battery life is great on my box, but I've had several hit and miss coils that didn't even last a day. Luckily the shop just threw a new one on each time, and sent me on my way.
I think my next purchase will be an RTA. However that being said, I always love coming back to my room after work, sitting down in my comfy chair, building a subohm coil, throwing a fresh battery in my mod, filling up the juice well, and vaping huge clouds on a couple of my favorite RDA's.