Which stream to select after 10th, Start with class 11 or diploma in engineering?
It seems you are planning to do engineering.
Either of them are fine. Taking up diploma could be good choice, especially, if you have already decided engineering as your career.
However, there is no compulsion on doing diploma engineering, if you are planning for B.Tech / B.E. for higher studies. You can take up 11th (science).
Also, if you wish to have more options after 12th, taking up regular 11th (with science stream) could be a good idea.
It happens that sometimes after 12th we can have a change of mind about the course we might want to do. In such a situation taking up science in 11th is a safer option, as we have the option of either doing engineering and something else that we find attractive after 12th.