Wing Chun is very different from Taiji. I think Wing Chun
stresses on small stance, side blocks, grips and short punches.
While taiji is base on follow flow and counter movements. Most of
the time Taiji follows thru the opponent's movement to eliminate
his center of gravity.
But both styles displays defensive stance most of the time rather
than offensive initiatives. Wing Chun displays more offensive
counter attacks than taiji.
If you combine the two together, it'll confuse most opponents. A
thought for you.