It all depends on what vape juice you want to use as well as what style of vaping you want to do.
For MTL (mouth to lung) vaping with 50/50 e-liquids, we'd recommend any vape coil that's rated at 0.8ohms or higher.
For a RDTL (restricted direct to lung) vaping experience, then you can use coils rated between 0.5-0.7ohm and this does give you the ability to use High VG e-liquids if your device can operate at slightly higher wattages.
And finally if you're wanting a DTL (direct to lung) vape, then you'll need to use a coil that is around 0.4ohms or lower and you will be able to use High VG e-liquids as your device will be running at higher wattages meaning it'll properly heat up the thicker e-liquid to turn into thicker bigger clouds of vapour.