I don't have the choice with my half-frame camera. It has a 28mm f3.5. 😀
I do have this debate with myself. Not only do I not limit myself to one camera one lens, I usually carry two cameras - one digital, one film - at all times (ignoring my phone camera, which is a decent one, but I don't tend to use it).
I like the 17mm lens for my EPL-1, but my cameras I carry with it have lenses between 35mm and 45mm generally, so I usually have the kit lens on the digi, to pick out architectural details, and for macro shots - the two extremes I'm not so able to manage with my film cameras.
That said, it's not that I'm indecisive. Each camera I have offers something slightly different. But, ultimately, it's my vanity that keeps me using all those. If I were restricted to one camera, one lens, I have no doubts about my choice.