Well.... hate to say it but both of the mods you say in your post have internal
batteries and they are going to die eventually. I have 3 Istick 50's that all have spent batteries. With regular use and charging you maybe get a year out of a hitter with internal batteries if your lucky and don't wear out the 510 threads first. You'd be better off spending the few extra bucks getting 18650 batts and a good charger along with a hitter that doesn't have internal batteries.
I have hitters that go up to 100 watts but I hang around 20-40 watts(.3-1.2ohm builds) and have a great vape with claptons and stainless steel. If you do get a external battery hitter then IMO avoid the single battery ones if your planning to vape wattages higher than 20 cause like me once your batts begin to show their age they loose their punch and you don't get many vapes before "low battery" indicator flashes. Using dual batts you get a better life out of the hitter with older batteries like my Istick100 (2 years old) does good but I put a old airflow adapter to save my getting tired 510 threads from stripping.
Review the hitters and google "(the hitter you want to look at) problems" to see if there are issues that some reviewers don't tell you and find out after you've bought the unit.