Congrats on your admits!
It is a personal decision and many factors in there besides $$$. We all pick things based on quality, etc but when we hear the price, we often reconsider the decision. Ross is a great school yet at the same time it is not Harvard of Stanford with an iconic brand. It has been around 10 points ranking higher than Olin consistently and shot up this year. Olin was in top 20 in the last few years so it is not a dump either.
I would point out a few quick things:
1. I have never seen anyone pay back loans in a few years - it is very very hard. After 2 years of school you will need a new wardrobe, new car, new place to live, etc - you will be tired of being broke for 2 years. I only know one person at GMAT Club who managed to live very frugally after graduating his MBA and save most of his money. He did amass a small fortune with stock/etc within 5 yeas of graduating but it was a sacrifice.
2. Where Ross shines vs. Olin is on campus recruiting. It is the big value of a large program and a big brand MBA. By taking the scholarship, you will be losing some of this value to potentially recruit with Microsoft, Amazon, etc though they are not a slam dunk either... but still. Same goes about internships. With Olin, I would plan to do all recruiting off campus and be on your own. Maybe the career services will help but I would not count on it. As a US applicant, you have an advantage in a sense that you don't have to worry about work permits or language barrier.
3. Salary figures can be deceiving esp since they are self-reported. However making $120K+ for someone in late 20's early 30's is very doable with both programs. It really depends if you can get into the right company. This money goes a lot further if you are in mid-west however, rather than in Bay Area so keep in that mind, and look up rents to get an idea how little 120K buys after taxes
4. Check Reviews for both schools:
https://gmatclub.com/reviews/business_school/olin-61https://gmatclub.com/reviews/business_school/ross-8See if things jump out at you and if you can live with some of the weaknesses as a trade off for $150K. The easiest way to pay off a loan in a few years is not to have one at all.
Good Luck with your decision!