All national law schools are good and it depends upon your score/rank and the college cutoff that which NLU you get admission in. The admission process in different for both the colleges. To get admission in NLU Delhi you will be required to clear the AILET exam whereas to get admission in RMLNLU Lucknow, you will get selected through CLAT exam.

It is important to do enough research before you choose any college.

As per Careers360 rating, NLU D is rated 5 that is All India Rank and RMLNLU as 15,  All India Rank.

As per the recruitement stats you can expect good packages once you clear your studies in NLU Delhi. The status is high as well as the placement records are good. The averge package is approx 12 lakhs per annum as compared to the other NLU where on an average you can expect a package of 8-10 lakhs per annum.

Good Luck.