It's really going to depend on your personal vaping preference. If you are happy with what you have, you don't necessarily need a "powerful" device that blows huge clouds. It is very true that if you turn to sub0hming you may enjoy it but your costs will rise, in batteries and most of all e-liquid so if you are happy with your device, that is what matters most. There is no "best" device, but you may want to do some research and looking around to get an idea of the types of setups available in case you wind up wanting to purchase a backup or an alternate device.
If you don't use nicotine regularly, I'd be careful how often you vape even low nic, it can lead to sort of developing a nicotine habit, and if your brain doesn't "need" nicotine, it's easy enough to vape enough that your brain may end up sort of "wanting" it.
Best of luck,
Anna