Didn't LAV sell more than True Blue, at least in the US anyway?
In the US, yes.
However, it notably had fewer major hits; TB was the first female album ever to chart five top fives (after Cyndi's debut was first to chart four). In fact, Control had its fifth top five single very soon after IIRC.
5 top 5 hits (3 #1s) and Papa's Grammy nom should win out over LAV's highher sales, and I'm confident a Madonna era will place in the top 10... So, True Blue's my pick.