I'm with Herc. Unless all your songs are in the same key...!
I've often read there's a chance the toms will get lost amongst the other instruments if you're playing notes/chords that cover the tuned drum notes.
Personally, I like tuning the tom to its most 'natural' note, whatever that is - y'know, the sound where it just 'sings'.
As long as the steps between the toms are pleasant, that's what I've found I prefer.
Kit: Roland TD-30; KD-120, PD-125(3), PD-105; VH-11, CY-15R, CY-14C(4)
Aux Roland BT-1, DP-2 Pedal(2); Hart Dynamics Hammer
Hardware: Roland MDS-9 Rack Tubes; Gibraltar 9606 SN, 9607-LD HH, 9608 Throne, 9611-DD Single Pedal; SC-4425MB Booms,
SC-RBA Tube Clamps, SC-EA100 Grabber, SC-700HA Tom Arm; SC-GCSRA, SC-GRSCTL & SC-GCHML Road Series Chrome Clamps