[ERISS]

If you want a mechanized unit then you should land North:
if you go from South you will have to go through more mountainous land (such as the old 'Massif Central', not high but very large and still mountainous), so you better need motorized (for swifter strategic move, not combat) infantry with more artillery than tanks, than the mechanised 2ème Division Blindée of Leclerc, which landed in Normandy (2nd French Armored Division, 1 August) where the land is far more flat, but maybe more treacherous with bocage, why you do need much infantry if you don't want to lose many tanks...