for factory defensive I use golddots in my 9mm, 40 and 45
For basic plinking I either use my handloads or what ever is cheapest
For rifle I load my own for plinking and hunting, but if I had to buy factory it would be nosler custom or weatherby. Hornady is another good choice.
for cheap hunting factory loads (under $20) in rifles I like the federal power shok's since they seem to be the most consistent with their loads (after testing several different makers bottom end hunting bullets over my chrono and on paper)
foregot to mention .22 i like mini-mags (they can be had for $7 a box of 100 here locally) for my 10/22's and remmy cyclones for everything else (this stuff is actually in stock where i am at, but at $2 for a box of 50, but better than nothing).
shotguns, what ever is on sale, usually federal or winchester 100rd boxes in 6, 7, 7.5 or 8. for waterfowling I shoot what ever is cheapest and in quantity, luckily i am sitting on lots of winchester steel from a local kmart that was recently getting rid of their ammo they still had on shelves in the warehouse from the mid 90's and i walked out paying $3 a box of 25 (bought every case they had of it).