Both IET Lucknow and Banasthali are very good colleges for CSE and offer very good facilities to its students. Having to know some people studying in both these colleges, I can share some details about them which might answer your question.

• In IET Lucknow, students get very good opportunities in terms of internships and placements. 
• A lot of companies visit the campus for placements but they select a few deserving students. Make sure you have the knowledge and skills to secure placements.
• Banasthali is also a very good college to pursue CSE. 
• The campus is very big and the hostels are well maintained. The placement scenario is better than IET. 
• Many top companies like Microsoft, Goldman Sachs visit the campus for placement opportunities.

Hence, both the colleges are very good in terms of placements and college life and it depends on your preferences and requirements on which college you will choose and take admission.