Which is better, CSE at NIT Delhi or IIIT Lucknow?

Without any second thoughts, IIIT Lucknow is a fairly better choice than NIT Delhi in terms of infrastructure, coding culture, and placements. Let us consider these criteria individually.

• Infrastructure: NIT Delhi is quite far from the hostels so the commute time is high whereas IIIT Lucknow campus and hostels are in close proximity to each other. It hardly takes 5 minutes to reach the campus from your hostel room. Thus saves time. 
• Coding Culture: IIIT Lucknow has a more extensive coding culture than NIT Delhi. Recently, a team of students from IIIT Lucknow secured 9th position in ACM ICPC regionals. The performance of the recent batches is also testimony to the excellent coding culture.
• Placements: IIIT Lucknow is definitely better in this aspect too given that last year its higher package stood at INR 59 LPA. 

Overall, IIIT Lucknow is easily the better choice than NIT Delhi considering all major aspects.