You lost me somewhere in your question.
I understood you used cartotanks, but I'm not sure what you are currently are using. Still using cartotanks? You are probably finding that cartos and cartotanks are slowly disappearing from the market. So, are you asking for suggestions for replacing your cartos and cartotanks?
I get that you aren't interested in making your own coils. So I'm thinking you should go with a clearomizer tank which uses factory-made replaceable coils. Clearomizer coils are easy to replace, and the latest generation coils are as good if not better than cartomizers.
I'll make a couple of recommendations for you. Both will give you a similar vaping experience as your old cartotanks.
Aspire Nautilus (regular or mini)
Kanger Pangu
The Nautilus uses 1.8 ohm coils, so you can use this tank on any battery device. The Pangu is a sub-ohm tank with 0.5 ohm coils, so your battery device must be able to fire sub-ohm coils.