Best ice auger SHAFT for use with a cordless drill?

[BearLakeFishGuy]

I know this will be something like a Ford, Chevy, Dodge question, BUT I'm definitely in the market for an ice auger shaft.  I've been using my blue 8" Mora auger for over 30 years. It has cut thousands of holes.  But my shoulders are telling me this won't be an option in the future.  I've looked at countless videos on YouTube talking about all the pros/cons of the various auger shafts to use with a cordless drill.  Now I'm asking for YOUR help to spend MY money!   What auger shaft are you using?  Why do you like it better than others? This is one requirement:  I plan to drill overlapping holes and I definitely want an 8" size.  Here are what I've looked at:
Kdrill
Strikemaster Lite Flite
Nils
Eskimo Pistol Bit
Jiffy Torch

THANKS in advance for your opinions!