Tank heavy needs good ground and a short route for less fuel use, while infantry with or without support units can go either way. the choice is your's commander.
Make sure you make the right one, as if this fails, so will the success of the 2 other Army groups.

please remember you don't start off where this shot is taken from either, but it's just where i've ended up at a given date tbh, while you could be further forward or back from these positions depending on your play style and ability, hopefully better as i'm useless at games but do enjoy them, sometimes i follow history and it's directions, and other times i don't and go off on my own path and see how i'd do, mostly worse tbh but it's all fun and enjoyable and adds to re playability[&o][&o][&o]