FYI, I have three different sizes of carryons. I have the 15" Lipault as my small one, a Tumi Vapor International Carryon as my primary, and a Samsonite X-Space spinner (the 17" ostensibly) as my medium-sized one.
Which one of these I take depends on what kind of trip I'm taking. For my one-weekend trip to LA, I took the Tumi as my sole bag. For my trip to Europe, I took the Samsonite for the regional jets, and checked my primary bag (a larger Tumi Vapor), and if I'm on really limited planes or have really limited weight, I carry the Lipault (which I otherwise put in my checked bag as an "oops, I overbought" option for the trip home).