I AM GETTING ADMISSION IN UPES DEHRADUN IN CSE MAINFRAME AND ALSO IN JUIT SOLAN WANAGHAT CSE BUT I AM CONFUSED WHICH TO OPT PLEASE TELL ME?

You can opt any, there is not much difference between these two.if u are look for better option then go for Lovely professional university, PEC, thapar. compare there ranking online, number of intakes, infrastructure, international students, faculties etc. dont take decision immediately.