The main reason I would recommend the 2 group right now is redundancy.
I think that feature is much more important to your situation than mine for 2 reasons.
1) Because you are more espresso focused than I am. I will be pulling shots on it every day like you but will not be "out" at all if I need to go to another prep or a few days to replace a seal. For you I can see real benefit to rolling over to the second group and not missing a beat.
2) I am not dropping my pump machine. Even if I loose a seal and for some reason don't want to accept a different prep I can just flip the switch on my tin foil espresso express.
I'm not ruling it out because you might come up with more reasons before I purchase and if you start using both groups to build something that can't be done with one......well, that is a a game changer for sure and I'm getting the 2.