You allready bought the LATs and now you are interested in Vandys?
Play the LATS live with them and then if you are unhappy you can move to something else.
The Lat is a far superior product to the Vandys in terms of construction and build quality. The LATS have great dynamics, however, they do not have very deep bass, their soundstage is good but not great.
The LATS are very good at realistic volume, great dynamics, good low level detail. They are not bright.
Used with a good subwoofer and the right components they can sound quite good.