I have on regular occasions been in in a position to experience two phonostages.
I have had the option to use different Tonearms and Cartridges, but experiencing these does not in my experiences, impact on the presentation in the same manner as changing the signal path via the Phonostage.
To work with the impressions that can be made, I have a few resident SUT's but have had the loans of other SUT's and Head Amp's.
There is something about the differences a Phonostage can have on a replay, and the want to learn much about this has led me to be party to numerous demonstrations of devices.
I have come to learn there is a small selection of Phonostages I would be happy to be with, would I like to have them all at home and select one that supersedes all. No I would not, I like the memory, the recollection and the want to get out and encounter such wonderment once more.
It is very satisfying to be in the company of a device that makes such a positive impression and creates a real feel good factor, but for all these strengths, is not enough to tempt one of their much enjoyed owned devices. The experience of being able to gauge where a system is and know that any alterations will be a change only, but mot a change for the better is a comfortable place to be.
The differences recognised between the devices, and the alternate usage of each device, is almost a selection to suit a mood, and ones mood is usually dictating the Genre selected to be replayed, the alternate usage is certainly not an attempt to improve the system. I am suspecting this is where the OP is finding they have arrived at with their options for the two devices available at present.