Just as an introduction - I picked new Stage yesterday.
Day 1 tasks included updating firmware, setup Rig Manager on PC and IPad.
Have not used it yet - work keeps getting in the way.
I use the following on the few gigs that I play:
Primary Setup: Line 6 Helix LT and PowerCab Plus (1x12) - works great and is my go-to setup.
I like having the XLR out on the box going to FOH which s the same as what I hear on stage.
I play in a Santana tribute and volume onstage is quite loud as the Keyboard player has a Leslie box and horn as well as a Musicman 2x12 Guitar Amp (70's) on top of the stage. Sensational sound.
Will try the Stage out with the PowerCab before I look at the Power Kabinet. Tried it out at the store and it didn't seem to have anywhere near the same volume as PC+. Used the stock presets and probably didn't know how to use it.
The Power Kabinet is smaller and lighter - I like that. Once I get the patches I want, will test the Power Kabinet again.
Other gear I have and use periodically:
Boss GT 1000 Core
Ampero MP 100
Mesa Boogie F-50
Fender Mustang GT 100