Both the colleges are good. If we talk about placements then IET is better option.
You can also compare both the colleges from the given below link
MMMUT
http://www.engineering.careers360.com/mmm-engineering-college%C2%A0-gorakhpur/reviews
IET
http://www.engineering.careers360.com/institute-engineering-and-technology-lucknow/reviews
Good Luck!!
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