hello aspirant,

it really depends on the factors, which you want to take consideration in-

In terms of teaching , both RMK & REC are good colleges

RMK got a mess where they serve you good non-veg food whereas rajalakshmi college does not offers non-veg food

REC is quite lenient when compared with RMK .Campus ambience is good in both the colleges but now REC campus is well modified and has more greenery.

academics is similar in both the colleges, now it completely depends on you, that in which college you ant to spend your academic career,

try to visit the college, it will surely help

hope that helps

all the best