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I think it will be better to go for software engineering if you are interested in softwares, programs , codes etc. IT is a broad field which has many branches and faculties, software engineering is one of it. While Bsc CSIT focuses on computers and Information Technology broadly. Its like BSC in chemistery vs Bio Chemestry. Software engineering is a part of IT which also contains more components other than IT. So this is a mix of IT and engineering that is focused on softwares. Software engineering is more practical based while bsc csit is more knowledge based. do some more research before you jump into one. Since you mentioned that you are more interested in software related fields it becomes easier for me to recommend you software engineering.