As your question is for 2021, without doubt the quality of students joining CSE in RVCE is likely to be miles ahead of the input into PES. PESAT input is not that valuable as CET or COMEDK and PESIT fills after probably 5 branches of RV fill in CET.
On the other hand the quality of teachers in RVCE CSE while being good, the quality is PESIT might be better as they tend to spend and hire more qualified teachers.
In terms of environment, RVCE is well rounded, not sure about PESIT. For placements RVCE is better and for MS abroad both colleges are on par. So you should decide on what you want, but the first choice for a typical student yet is RVCE. All the best.