ECE is more concerned towards electronics and how the different electrical components work. It is more inclined towards physics. There is a little bit of programming involved.
On the other hand, CSE communicate with the devices by the means of programming languages. It has a lot of logic involved and Maths too.
ECE has more scope in government bodies like most of the PSUs recruit Electronics engineers than CSE and the scope of CSE is good in Software Industry and IT sector. The packages for both are good depends on which organisation you get placed in.
You should ask yourself what you can really prefer or feel. If you can choose better following your passion with strong mind setup, you must do better. No matter whether you are average or not.
If you like programming, then you can go with cse. Just think about your strength, passion. What is your point of interest, take that branch.