Sniper: Only one kill at the time. Mortar: Can have multiple kills in one moment.
Sniper: Requires a lot of micro. Mortar: Doesn't require micro.
Sniper: Can kill a specific model you want to kill (the gunner of an mg). Mortar: rng based of what he hits.
Sniper on open long range maps.
You can always make a mortar tbh.
A bit useful?