+1 for the Ikenvape Platinum, punched. The only thing I don't like about these is they are frequently out of stock. I get at least 2-3 additional refills with these in my IBTanks. Nice flavor production, too.
I've tried two of the Ikenvape Fusion 801's. They need a 510-801 adaptor to use. First was a total dud (it happens). The second one vapes great. After 4 days of intermittant use in a tank, I can't tell any difference from the Platinums. There are now 510 Fusions listed on the website, but they are out of stock, too. (go figure

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My choice in carto prior to the Platinums, and now my backups, are the Smoktek single coil tank replacements 3.0 ohm in either one or two laser-drilled holes. Flavors not as pronounced as the Platinums, and a couple of DOA's out of perhaps 30 cartos. Not as long lasting as the Platinums, generally speaking.