TN= faster refresh rates and response times like 144hz or 1ms (better for gaming by most peoples opinions)
IPS= better color and viewing angles (also the type of panel most mobile devices use)
VN= slightly better that TN (using logic I thing that asus's VN seires uses VN)
PLS= slightly better that ips (possibly not as common as VN)
Personally I like ips more for the better colors.
Hope this helped,
MRE