Hi Sharib,
it depends on what you are going to do in future. Get an overview of the two modules and make yourself familiar what companies around you and see the jobs listed at their homepages...
Which module you are going to start isn't the basic question here. Moreover you have to ask yourself if you want to dive into.
( module FI, if you are at your current position having fun and like the content. That is also a huge module and you know, every company needs the guys who handle their money
)
In my opinion it doesn't matter with what you start, it all depends on that you start.
Regards
Florian