Both the colleges are good but if you want to prefer one you can go for PSIT Kanpur as it offers better placements.
You can also compare both the colleges from the given below link
http://www.engineering.careers360.com/galgotias-college-engineering-and-technology-greater-noida/reviews
http://www.engineering.careers360.com/psit-college-engineering-kanpur/reviews
Good Luck!!
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