Well, for me the activities that I plan to participate in or the type of dress has a big impact on what I carry. For instance if I am dressing in a more formal manner I carry a LCP instead of a .45 SIG. If I go for a short hike I may carry a small .38, but if I plan to spend time in a more rural area I may pack the 10mm. I suppose I could use the SIG P220 for all situations, but then how could I justify all my other guns?