With 140 pending, you probably won't dare to change job or make any long term dicision.
If your 140 is based on EB1 or EB2-NIW, then you CAN change jobs after filing 485 over 180 days, as far as it is in the same field.
Another advantage is that with EAD (as a benifit of filing 485), you are no longer limited by H1 caps.