In business class, you would be doing a lot of the trip in domestic FC, including probably a very early morning departure. In fact, I'm not sure whether there's a same day or nonstop PHL-SEA that would connect to TPAC flights from SEA. Even from the midwest, I avoid SEA TPAC connections like the plague because I prefer the longhaul segment to be long enough (nonstop) for a nice relaxed meal followed by a full night's sleep.