If you are box modelling wings has a few tools that blender still lacks ie. intrude. Wings also supports ngons which blender does not (this is a big deal for some people although it isn’t for me). If I create more complex models in wings (try a cactus with a lot of spikes) I find that it slows down considerably, I gather this is because of the size of the data structures involved.
If you like to model by extruding faces or a combination of face and box modelling (the way I usually work) it is usually easiest just to do it in blender.
So in summary – unless there is a specific feature in Wings that would make my life easier (ie. intrude) I generally just model in Blender. Note that before the loop cut tools etc. were added to blender it was the other way around – I modelled in wings3d unless some feature in blender made my life easier. Learn both and use whatever is best for the task at hand.