Hi Sachin 

There is no major difference in syllabus, it's just that there can be slight difference in question pattern of different boards but because every board follows NCERT syllabus so syllabus remains same for almost every board. 

Another difference can be that HSBC is State board whereas CBSE is central board.

CBSE is recognised worldwide whereas HSBC is State specific. 

Also, your competitive exams after class 12 are based on CBSE curriculum. 

Your NEET, IIT-JEE etc are a few examples , these exams are based on CBSE curriculum, even if you go for higher exams like UPSC, ssc, then for that also students prefer to go through NCERT books to prepare for related subjects. 

So I would suggest that CBSE board is better because it has more recognition than any other state board, and if you want to prepare for competitive exams then also CBSE is best .

All The Best!!