Standard carts (poly/PTB/non filler) are basically junk in my opinion.
One does not want to drip because that's more filling constantly, opposed to less cart fills just a few times a day. Problem is that a filled cart only lasts about three times as long, and then you're basically dripping. I also feel like I'm wasting the juice that never get's vaped.
Carto's give a good steady draw every time, and I can get away from filling them 3 or 4 times a day. I was using those with great success, but I only had one and it has expired. I plan on getting more, but until then, dripping is great. I always bring a standard atty anyway incase I don't feel like filling my carto.
The down of dripping, aside from refilling every ten minutes, is the spill/leak factor. I hade the residue the niquid leaves on my fingers.