depends…
the wider the vbit angle, the shallower the cut for lettering/designs of the same width, the thinner the vbit angle, the deeper.
also the thinner the vbit angle, the more precise, and the wider the vbit angle the less precise.
if you have thin fine detail, you’ll get more detail with a narrower angle bit, and it’ll cut a bit deeper, so it’s generally good to use the narrower angle bit there… but if it’s small but blocky, you can get a shallower cut with a wider angle.
for larger lettering/designs a wider angle gives less (to none) of a floor pocket, and is also slightly more friendly to things like solid color resin filling (since it’ll have less volume to fill), but otherwise might be more of a style choice beteen v-groove and flat floor.