From where should I do B.Tech. in CSE the college which is affiliated to MDU Rohtak or the college from PTU?

Both the Maharshi Dayanand University (MDU) and the I. K. Gujral Punjab Technical University (PTU) are public universities consisting of many private and public engineering colleges. If you are getting private colleges in both of the universities, then there is no point of comparison as both will be essentially the same.

For a good job after your studies, you need to concentrate on the training you will receive between your studies. Also, you will have to practice programming languages very thoroughly. If you can get a percentage of 70% - 75%, then getting a job won’t be a problem in either of the universities.

If you want to stay outside to become independent, then sure you can join any college which is a little farther from your home.