For me, like jskline5, marching baritone dictated my use of finger tips on the valves, but whenever I play front action tubas, it is entirely overlap. Mainly because of the larger distance between valves compared to euphonium as well as how far out they are from how I have my hand positioned, and it only makes sense for me to do that, but on euphonium with upright valves, I can only use tips because of my hand type and positioning.
Adams E1 SS, Gold Brass Body .6mm DE Euph N103 Jcup, J9 shank
Meinl Weston 2141 Eb Tuba PT 84