Both the options you have are quite promising as both Microsoft US and Samsung Korea are top companies in the IT sector. But personally, I find Microsoft US a preferable option to Samsung Korea. Here’s why
Had I been in your place, I would have gone for Microsoft without any second thoughts even if it offered less than Samsung Korea.
It’s difficult to comment on the amount of money you will be saving as I don’t know about your salary package. If it’s around USD 100,000 you’ll save enough.