There are more then enough threads asking the same exact question.
Heres a quick breakdown:
TRS 2009 WBE:
Custom traffic shows up
Error checking isnt as strict
Only new stuff is a engine, tree, and station
TS 2010 EE:
Most default content is updated to TS 2010 standards
Error checking is more strict
SpeedTreez
New routes/content
Just my quick analysis since I use both.
hert:wave: