Should I make the jump to 14500 batteries?

You’ll love lithium ion cells, no going back after using them :wink:

The Thrunite T10 is fine on high & low but the medium mode sometimes flickers when using 14500’s.
I don’t know the other two.

For just starting out you could get a cheap intellicharger i4 v2 which will charge both chemistries so less hassle.

There are shortlists of what i consider good batteries & chargers in my LEDs & Other Stuff post along with tons of info & useful links you’ll want to learn about.