Not a fan of the A380 in F or DFW airport. I have found very competitive fares via SEA on the 781 in F. It all depends on how elongated you want to make your day with a connection. I flew to SJC via LAX, enforced by a BA cancellation and that added 4 hours onto an already long day. Really depends on how good the fares are and how much you are prepared to pay.