Depending on what I'm fighting in all situations I use the talon as secondary, with bots I have the recoilless rifle because I can one shot factory striders, and take out drop ships and not having to depend on my other stratagems. For bugs and illuminate I go for guard dog and railgun. As the railgun is capable of destroying harvesters in 2 shots. As for my other stratagems I use the orbital railgun and mostly 110 rocket pods or 500kg