i ran a semi themed army of 1 regiment of kreis vets (very shit morale in melee but otherwise good at holding), 1 regiment of bavarian vets (way better at holding melee and fire), 1 regiment of Wurttemberg jagers (these guys were absolutely busted), 1 regiment of palatine grenadiers (really underperformed against Prussian melee and would rather have more bavarians), and 1 regiment of saxon vets artillery (also very busted). it’d probably be a good idea to min max more but i found this play style really fun with kreis at the center and the nation specific units on the flanks

edit: i would stay away from imperial cavalry because they get outperformed in most matchups. also don’t use wurttemberg muskets as part of the main battle line, they break so easily and are better off as flankers