That's a tough question, like asking "which is your favorite child." I would say the top four (one per kid) are:
1. Colt Series 80 Officer's ACP in 45ACP;
2. Walther (Interarms) PPK in .380;
3. Ruger Security Six in .357;
4. Dreyse 1907 in 32ACP
Like my kids, each one is VERY different from the others and each serves its own purpose in my eyes.