I wouldn't have chosen to fight in any war, unless it was necessary. Nothing glorious about seeing your best mates shot or blown up IMO.
If I have to choose a war though it would have been pre-gunpowder, where personal skill on the battlefield would have meant more than it does in modern combat. Being a Samurai would have been pretty cool so I guess some of the feudal Japanese wars.
The Japanese Army in WW2 was in spirit a Samurai army. They harnessed the essence of 'budo' or the 'the way of the combat' and to surrender or be captured was the worst shame they could endure. Shame, or lack of it, is very important in Japanese culture. This is why very, very few Japanese soldiers were taken prisoner in WW2 and why any US invasion of the Japanese mainland would have resulted in a blood-bath.