What is your favorite army composition-I dont mean division composition

So was wondering how you guys like to group your armies because I'm looking into how to do things in new ways.

I use the 24 division armies with 20 inf divisions and 4 tank divisions. Figure that gives me a good ratio of tank to inf ratio. Though sometimes have a motorized or cav division replacing them if production needs are too great.

Then I have specialized tank armies or mech inf armies of 10-15 for pushing shit.

Recently tooling around with large field marshal led armies while using my standard 24 div field armies to reinforce/push particular sectors...use the 15 div tank/mech armies for the same.

So I got a standard now of a FM army of around 50 div with two supporting 24 div armies while the tankers go where I need them.