On an intl flight, $200 isnt THAT big a difference (depending on your fare). And given all the extra perks you get if your a delta frequent flyer (bags, lounge, free EC) those all easily are worth more then the $200 your saving. Plus if it came down to save $200 and fly some other airline, or pay $200 more to fly delta and get miles/mqm.....no brainer go delta