I read that circs were easier for traveling and they surely are. With straights I had to sit just right in the truck. But the first time I used circs I remember thinking "I wanna go home and get my straights." But I didnt, I got used to them real quick and now I could never go back. My ten year old dd loves straights so I've kept them around. I wouldnt buy another pair.
Circs also distribute the weight better on my hands. I never ever have sore hands with circs. And you can't loose one needle! I love that! And they rarely get bent or broken.
Cause they are too short.