Are there any differences in performance between the titanium tip and the 2020M tip? Also between the shorter and longer VC?
The general consensus, so far, seems to be the 20 M stainless steel tip and captive cap is a sort of "Middle Ground" between TRADITIONAL stainless steel tip and titanium tip.
Many have noted so far and I've noticed this as well on mine, it's much more difficult to combust with the 20m tip & its captive cap than previous stainless steel tips.
Presumably because of its increased airflow and ultimately it's lower heat clicking temp.
It's been described as (likely) George's attempt at transitioning over to low temp Caps as a standard (so it's harder for people to accidentally combust and lots of flavor hits) without ACTUALLY making all the caps low temp caps.
Who knows, except George, but from where I'm sitting, the reasoning sounds legit.
Happy Vaping!