Compare 787 Dreamliner and Airbus A330 ?

[Heng]

If flying economy, I usually will choose the A330 flight (as long as the airline uses that standard 2-4-2 Airbus configuration) as we tend to fly as a family of four.  Other than that, you may want to look into the airline in particular as there are a lot of variations involved even with the same aircraft type.  You might have a better seat and more comfortable flight on a recently refurbished 20 year old airframe when compared to a young 5 year old airframe, but you might have more peace of mind (and restful sleep) on the newer aircraft, the slim line seating trend offers more leg room, but you will feel it more often when the person behind you is someone who has to take his/her phone out of the seat back pocket 20 times during a flight, etc.