Well, the only aircraft I've flown for FS is the default 737, 747, and 777. But out of those I choose the 747. I love taking those long haul, overseas flights. I've also been noted to make nice, smooth landings with it...usually
In real life I guess it would be the 777. I don't fly them of course (I'm only 15) but I've had more experience with it than the others. Once at Boeing Field in Seattle, I watched a 777 (Boeing Colors, I guess?) thunder down the taxiway, take off, and roar into the skies. It was an awesome moment. Here's a pic of it from Airliners.net. The picture shows it landing and the next day I watched it take off
http://www.airliners.net/open.file/456337/M/
EDIT Just found a link to the aircraft above. Did it get a repaint and now belongs to JAL Airlines? *Note the same Aircraft ID*
http://www.airliners.net/open.file/568996/M/
Tsunami- That plane you watched Takeoff in the "Boeing Scheme" was the first ever built 777-300ER! You are one lucky Guy! I bet the roar of those GE 90-115Bs was awesome!