Both the tests are worth giving.
CLAT gives you admission offers of one particular NLU based on your rank and preference. And, sometimes this law school may not be the preferred choice for you where you wish to spend 5-years of your life and career. Hence, it is advisable that writing the below exams are crucial for a 5-year LLB aspirant in India to have multiple admission offers so as to make the best choice
CLAT for 18 NLUs including NLSIU, NALSAR, NUJS, NLU Jodhpur, NLIU Bhopal, GNLU, HNLU & other 11 newer NLUs.
LSAT—India for Jindal Global Law School & over 70 other law colleges
SET for Symbiosis Law Schools in Pune/Noida/Hyderabad
AILET for NLU Delhi
CET of GGSIU Delhi for USLLS of GGSIU, ALS Delhi, VIPS etc.