Hi aspirant, since you have the chance to choose in between IIIT and IET in my opinion you should definitely go for IIIT .Firstly because IET, Lucknow is owned by State government where in comparison to that IIIT is a Central government owned college. Secondly since IIIT is a cental govt. owned institute hence the placement of IIIT will always be higher than in comparison to IET. So overall what you get in IET you can also get in IIIT but what is in IIIT is not in IET.

Good Luck.