It's kind of cool, at least 3 different strategies were proposed, each quite different... And I don't think any of them is better or worse than another, rather they reflect the playing style.
Whereas some see no problem losing a couple provinces for a short time, I am always very reluctant to give up anything without good fight. Just to let them know that it was not free. Sure, sometimes I get more casualties this way than I would have got with wiser withdrawal, but also sometimes I manage to win the superior odds, so it's 50%-50%...