We took the trip from Santiago to Mendoza this March.
CATA bus, cama ejecutivo.

No snow issues, as March in Argentina is our summer (June in the northern hemisphere) but... the bus was kinda oldish and broke down resulting in our waiting at a derelict bus station on the Chilean side for a new bus to come from Argentina.

5 hours delay in arriving to Mendoza.

Apologies? Yes, some, verbal.
Food vouchers or some compensation? Free coffee, tea? Forget. None.

Next morning we had a plane from Mendoza to Buenos Aires, so instead of sightseeing Mendoza we just headed to our beds.
So much for a "pleasant" bus ride across the Andes between Chile and Argentina.

PS. Border crossing up there in the Andes - well... they speak the same language but the border is as "friendly" as the border that once existed between West and East Germany. Meh.