You'll probably get a split decision on this one. They are both decent tanks and it's just down to personal preference really. For me it would be the Artemis.
I agree with @rew, I would go Artemis. Less faff once you’ve got your head around the moving parts. Don’t disregard the Kayfun lite plus. Even the clone is good.
I personally love love love my Pioneer. For me, flavour it's much better than Kayfun lite and even better than Dvarw MTL FL. And that mouth piece is the best, I use it in all my MTL rtas