Max Hastings's superb book "Armageddon" is a "must read". I think it would be fair summary of his assessments of the armies that fought in the West from D-Day onwards that :-
a. The Brits were risk-averse. They were a "citizen -army" with somewhat pedestrian leadership still obsessed with the catastrophies of 1914-18 (Somme etc).
b. The Americans, for all the flamboyance of some of their leaders, were equally amateurish, although some of their formations (eg, the Airborne divisions) were brilliant.
c. The Sovs were totally committed, fought like tigers under some magnificent generals, and really won the war.
d. The Germans, particularly, the SS, were highly professional, brilliantly led , superbly equipped, punched way over their weight, and were collectively "men of the match".
Max was not very kind about the RAF - particularly Bomber Command. One of the main factors of the Allied victory was the attrition of the Luftwaffe in the air by the US 8th Air Force escort fighters.
Not very comfortable reading for a light-blue partisan, but the man is an outstanding historian. The in-fighting between allied leaders was scandalous. One wonders how Ike put up with Monty!