Please Help Decide

<p>I have got admission in BU for MS in Mech Engg with full tuition assistantship for 2 sems. But, BU is not there in the first 100 colleges for mech engg in usnews rankings. How good is BU for placements? I hv also got admit from Clarkson university with abt 30% aid. Clarkson ranks 82. what should I do? Please help.
Thanks in advance.</p>