The Talos can be converted between a pure planar mode and a planar + BA mode (the latter configuration is way more resolving and technical, though much brighter in the treble). So in a way, the Talos is more versatile due to the 2 switch configs.
But if we compare apples to apples and just keep the Talos to the pure planar mode, it is U-shaped, whereas the S12 Pro is V-shaped. S12 Pro is hence more bassy and "fun" but the bass isn't as tight and textured, with slight mid-bass bleed. The midrange is more recessed on the S12 Pro and vocal and midrange lovers might want to opt for the Talos if you like your mids.
The S12 Pro has less natural timbre. In technicalities, the S12 Pro has poorer imaging, instrument separation, and transients. However, the S12 Pro has better clarity, soundstage, and micro-detailing. But as discussed above, if we use the BA + planar mode on the Talos, it beats the S12 Pro in technicalities.