Differences from a pilot perspective of 200 vs 900:

If you are 6'2' you can stand up straight. Taller? Still hosed from my 6'2 POV.
Bleed(s) is automatic
Fadec aka, climb well above FL180 better than the -200
2 FMS heads
Meals on long legs (-200 limited to 750mi)
Forward lav (worthless when doing less than 750 mi legs)
CA's make more, FO slightly more than -200... But living on reserve longer.

In the end, -200 FO will make more in first 18 months. Do the math.

That's it.