According to Samsung,
Class B ( For residential Use)
The Class B (LS23B370H) is registered with EMC requirement for home use.
It emits less electromagnetic waves than Class A equipment (S23A350H).
I personally have S22B370H.....a very decent TN Panel.
But am selling it now for a Dell IPS panel.
My colleague has S23A350H....he says it's awesome !!
So i suggest you to go for the cheapest one available. (here it's S23B370H).