Sichuan Airlines typically offers Business and Economy cabins (with First or Premium Economy on some widebody/long-haul routes). Cabins differ notably in seating, catering, baggage allowance and mileage accrual.
For short routes economy is usually the best value; on overnight or long-haul flights Business meaningfully improves rest. Watch for upgrade offers with miles or cash around check-in time.
Product-wise: Sichuan Airlines flies an all-Airbus fleet in panda livery from Chengdu’s two airports. It is a specialist in high-altitude routes (Lhasa, Daocheng) and flies from Chengdu to Europe and Southeast Asia. Its Sichuan-style catering has a cult following.
On loyalty: Golden Panda members accrue miles by cabin, and elite tiers add seat, baggage and lounge benefits — worth joining if you fly Sichuan Airlines often.