UPES

Sorry for late reply. It has already out now. I hope you got message from UPES regarding to your result. And, counseling is going to start from 31 May.

You can directly ask to them. You can call them. They will better explain you about this. I don't have much idea about this.

Because many students get ranked low and don't come to UPES counselling. Also, many of those who get good rank don't come to counselling too.
So this time, when you will go for counselling, then they will tell your rank on the spot. So there will be more possibilities for getting a branch of your choice.

UPES is going to introduce its new branch i.e. CS in machine learning. So it will be good if you want to go for ML.
RV College is also good.
But if you want specialisation, then you should choose UPES.

Yes, it is decided on the basis of rank. But there are some chances that you will get petroleum engineering.
This time, they are not telling the rank beforehand. They will tell you if you will go for counselling or not. So there are more chances to get petroleum than before.

You should go for your interest because it is you who is going to do engineering. But placements of petroleum are quite good in comparison to CSE.
But it is a waste if you are not enjoying what you are doing.

I will prefer UPES.
I didn't give the exam for IPU. I preferred UPES over IPU because placements are very good in UPES in comparison to IPU (in my knowledge).

It is good. It's placements is also very good. It does't have much students so competition is less but you will be placed will good package.

For computer Science engineering I will prefer UPES. For automobile engineering I don't have much idea. In UPES CS branch get good placements. If you are above average student then you will get good package in UPES.