I think Germany winning WW 1 would have avoided WW 2. The Kaiser was far less imperialistic & evil than the Nazi’s. Had Germany not been financially decimated in the 20’s. Hitler would have never rose to power.
It’s slightly tangential but, per a book about the 1918 flu epidemic, if Wilson had remained healthy he would have been able to continue to deter France from vindictive terms imposed on Germany. He fell ill so France got their way, hence Hitler.