EVA Air 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: EVA Air, a SKYTRAX five-star Star Alliance member, is a North America powerhouse from Taoyuan — dense Taipei service to LA, SF and New York. Its Royal Laurel business class and Hello Kitty jets are brand icons.
On loyalty: Infinity MileageLands members accrue miles by cabin, and elite tiers add seat, baggage and lounge benefits — worth joining if you fly EVA Air often.