Also, as this is your first job out of grad school it won't make a big difference.
Stop looking for validation and be happy with what you chose :)
First things first TC:
Bloomberg - 160k fixed per year (base+annual bonus), 30k sign-on
Microsoft - ~155k fixed per year (base+stocks/yr+annual bonus), 30k sign-on
I chose Bloomberg over Microsoft. I personally felt Bloomberg engineers to be much smarter than Microsoft and overall felt the hiring bar at Bloomberg to be higher than Microsoft. My concern is that there are many students around me who look surprised when I tell them about my decision of choosing Bloomberg.
Do people in general feel the same about my decision?
My Background - I am currently pursuing CS Masters from an ivy ranked in top 10.