These are always fun things to think about...favorites can be because of a previous owner, or the things you have done and places you have gone with a weapon that makes it a favorite..
My list is pretty long, and as someone put it my favorite is the one in my hand at the moment..but long time favorites are:
1. a 5 screw K-22 that shoots super, and at one time belonged to my old trap shooting buddy..who is no longer with us...
2. a 22/32 that belonged to my dad..
3. a S & W Highway Patrolman in both 4 " and 6 " beause they shoot sooooo well...
4. a Marlin 39a 22. have own one since I was 18...
5. a 700 .222, my favorite p. dog rifle
6. a 700 in .22-250 on its third barrel, it has killed thousands of varmits and quite a bit of big game...
7. a 700 in .25-06 a great coyote rifle and large varmit rifle..use it some for deer/antelope, but like it best on varmits...
8. a 54 30-06..my first serious game rifle, my grandfathers, and my first custom stock by a good friend who died too soon
9. 700 in .300 Win.. we have been from Alaska to Texas, East coast to West coast, Canada, and Africa together..always deadly
10. 870 12 ga. field..owned since the middle 70's it has travel with me almost as much as the .300...I guess it has coverd the same amount of ground... it has shot thousands of rounds of shells at trap, skeet, varmits, and everything from quail to geese and wild turkey