I previously said I'd be keeping my Samsung-chipped 6s Plus. Well, turns out I just had it replaced due to the headphone port being too loose (jack would slide out very easily and audio would cut out)... and my replacement has the TSMC chip.
Still restoring data, so no ideas about battery life. I have a good idea of what I was getting with the old unit (had been using it heavily over the last week), so I may report back with this new unit's performance.
To be honest, though, I'm not expecting any noticeable difference. At least not in anything other than gaming, maybe...