Yes, IIIT Lucknow has a better package for CS and IT students than IIIT Allahabad and IIIT H. However, it will not give you a guarantee that you will get placed after completing your studies from IIIT Lucknow.

The following table will show you the placement record of IIIT Lucknow.

IIIT Lucknow has been established over many years, and is one of the oldest campuses of IITs. The Lucknow campus is from one of the top 5 campuses of IIT and probably the best one. It grew fast as compared to any other institutes 

The average salary offered to IIIT Lucknow students is INR 18.42 LPA, while the highest package goes to INR 43 LPA. The Median package is INR 15 LPA, and the minimum package offered is INR 10 LPA.

Seeing the current scenario, in future also, IIIT Lucknow will give good placement to its students. 

Therefore, if you are thinking of joining IIIT Lucknow then go for it. Because apart from having similar faculty to other top institutes, IIIT - L provides students to improve their technical and soft skills. And that improves the chance of their placement.