Thank you for the great insight @zappazapper
The switcher is really needed as, during a gig, I might need to reach for the backup guitar and activate immediately without the need of exchanging cables etc.
As for the LT: it does seem a great piece of kit but, from what I read, its even bigger than the G-System. One of the reasons to change is the dimensions/weight of the pedalboard. Ok weight would be better but dimensions - again a large pedalboard is needed. That's why I was inclined to the HX Stomp XL (for having amp + cabs thus letting me drop the AMT).
As for the LT tryout - where I buy they have a 30-day money back guarantee no questions asked, so I can try it and return if not happy :) Decisions, decisions...