Dear Student ,

It depends on your interest ! If you are willing to a job just after doing diploma .. then you can prefer that , and after some years of job experience , you may appear for B.tech  admission .

Well, if you are interested in higher studies.. then you can also continue your studies after diploma by doing  B.Tech and M.Tech ..

Degree courses will give you better opportunity and job profile in work field while diploma course will help you to give you a job as a basic level .

Age criteria also matters in job sectors .. various govt/private sectors have limited age criteria(like between 27 or 30) , based on that you need to balance your job and study..

So, lastly .. again I'm telling that it's totally based on your interest !

Hope my answer helps !