Trek Kids Bikes For A 16" Bike For My Son Is A Schwinn Or TREK Bike Better Long Term With Training Wheels?

For a 16" bike for my son is a Schwinn or TREK bike better long term with training wheels? - trek kids bikes

TREK-steel frame
http://www.trekbikes.com/us/en/bikes/2008/kids/

Schwinn aluminum frame
http://www.schwinnbike.com/products/bikes_detail.php?id=736