Whatever you carry becomes a personal thing. I carry what the season allows in the Northeast. Lately, it's a snub nosed .38 but it could also be a Sig 9mm or small .45! I have access to all of the above. There are so many variables in ammunition today that most anything is viable with the exception of the .22 lr but if that's what you have it's better than a rock!
You're leaning towards the Walther brand, any particular reason?