I'd push Tmax or TriX 2 stops - IF your metering determines it to be necessary. With a lot of external light and interior lighting you may well find you don't need to push much, and Tmax can be exposed at 800 with normal development with minimal loss of shadow detail. Both are highly capable of being pushed and even in low light produce excellent shadow details without a huge amount of grain - it does depend on your developing plans though. I find P3200 is grain at all levels and pointless you find you don't need it.
With my ageing eyesight I find it hard to nail focus at f1.4 in low light, so another consideration and obviously, with lost latitude, under-exposure can be fatal.
Tmax pushed to 1600 in very low light
TriX pushed 2 stops in like conditions
Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar, Leica 50mm Summicron V3, Hasselblad PME51 metered prism - all gone.