I made a post a few months ago about the rules I use. I am still checking out new systems.
I used Carnage and Glory II computer moderated rules for my last Katzenstein Campaign battle. I liked that they provided the exact #s of casualties and tracked morale.
They will still be a contender, but Field of Battle holds the lead. There is a new FOB2 being published that I will pick up at Fall In.
I am going to try the Die Fighting rules for a game as well. I like the concepts such as use of resource dice.
I have Black Powder and have not played them but I think I will like FOB better. I do like the special rules that can be used to make units more period specific...would like to see that in FOB.
I was listening to the Meeples and Miniatures Podcast and heard more about the Too Fat Lardies rules. I will investigate them further.
I have been collecting and reading lots of rules the past few years but I think I am settling into what I want for each period/genre. I originally thought I wanted lots of detail, but in practical application, it just does not seem feasible.
ImagiNation (Horse and Musket): Field of Battle
---Blackpowder and Carnage and Glory II are contenders.
Individual Skirmish: Flying Lead and the rest of the Songs of Blades and Hereos series
Squad/Team Skirmish: Force on Force and Tomorrow's War for Sci Fi
WWII: Flames of War
Ancients: Clash of Empires
---Hail Ceasar and Piquet are options
Space Ships: Starmada
Pirates: TBD (most likely SOBH variant)
Wild West: TBD (most likely SOBH variant)