[m113apc]

Interesting question.
I use infantry in support for my amour, not the other way around.
But that’s because I’m a tanker, I prefer tanks and supporting armored vehicles.
I like to play big battles in my campaign, with a full core, most of the time I have a core of 200. Playing SPWW2 I have up to between 10-15000 points.
Since I have fewer Infantry units; I pick elite units.
I also use SS in my panzer units.

As an example, I can go through the long campaign I’m playing now.
It’s Germany vs. USA/GB/Canada, June 44-May 45.

I always choose company formations, but I reduce them in size.
The reason is to have a chain of command, when it comes to rallying my troops.
1 company consisting of 2 platoons of Panthers, 1 company consisting of 1 platoon of Tiger, and 1 company consisting of 1 platoon of Tiger II.
Each platoon carries 1 platoon of Brandenburgers mounted on vehicle. These will supply close combat support to my tanks in built up areas or in areas with dense vegetation.

I will have 1 coy of Stug and Stuh, with 2 platoons of Stug and 1 Stuh, in support they will have 3 to 4 platoons of SS Panzergrenadiers mounted on Sdkfz 251/1, but here I choose my platoon without the Sdkfz, and buy them in the misc section. That way they are independent from my troops.

My third formation if you will it’s the Pionier, here I also go for a crack formation like the FJg, and I also mount these units on 251/1. In support I pick 2 to 4 flamethrowers and a section or platoon of Stuh. Since these units also play a defensive role in my play, I may support them with 2 to 3 AT guns or 2 jagdpanzers.

Other formations are recon forces mounted on 251/1, SPAA, SPA, ammunition vehicles and arty off board.

Sometimes I have a fire brigade also, existing of a mixed formation of tanks and infantry.

This game, which I have described here, is for pure fun, sometimes I play it as realistic as possible.

I remember many years ago, playing SPII, I built up my former armored battalion with its supporting elements in defense against a Russia motorized infantry regiment, all by the book. I stopped them, but it was an expensive battle. Back then, we didn’t have the Leopard 2 MBT, but the Leopard 1 with its 105mm, and we didn’t have the CV9030N IFV with its 30mm cannon, but the NM135 (built on the M113 APC) with 20mm cannon.
It was my NM142 TOW (built on the M113 chassis also) and ground mounted TOW units that saved me from the hordes of T-72 and T-80 MBTs.

I guess this was maybe a little bit outside your question, but I had to put my choices in a context.