can anyone tell me their preferred tank cartomizer using a provari?
I appologize, I misunderstood your request. I thought you were asking for cartotank recommendations for the Provari.
I'm using
Smoktek 3.0 ohm single coil cartomizers, one and two hole laser drilled. (Note spelling, this is not Smoktech the Chinese manufacturer/distributor. I have no idea who makes the Smoktek cartos, they very well may be made by Smoktech for all I know.)
I had been using Smoktech dual coil tank replacement carto's, mainly because that is what came with the tanks originally. I was using them in a variety of tanks and various resistances. I wasn't totally satisfied with them, as I often was detecting a harshness or burnt taste despite a good delivery of juice to the cartomizer.
I did a fair amount of research here. It seems that Smoktech came up with the idea of dual coils to allow 3.7v devices to make more vapor than a single coil carto could. However, I also read that to take full advantage of dual coils, they required at least 4.5v fed into them.

Contradictory?
Many people seemed to have switched to single coils and now preferred them. I decided to give them a try.
I bought a bunch from the above vendor in 2 ohm resistance, with one and two holes. Juices with a 50pg/50vg got one hole, anything with more vg got two holes. Changed out all of my dozen tanks with these new cartos and filled them fresh to use on my Silver Bullet and BB.
I have to say, I like these better. I'm getting just as much vapor and flavor as the dual's provided. No burnt taste, and moderately longer battery time. When I got my new Provari, I got more but in the 3.0 ohm resistance. Same positive results.
Now it may only be that I prefer a cooler vape. If that is so, then these fit my needs.
Single Coil XL Tank Cartomizer for the SmokTank XL