Is there a reason to spread your research into multiple journals instead of just one?
There is obviously no right or wrong here, one should try to publish in the best suited journal. That said, in fields where there are several options, sticking to a single journal may look a little strange. If you publish in different (but suitable) journals, it may be looked upon as that your research is accepted by a wider set of peers. Some may perhaps also think you have a special connection to the journal etc. 

So the need to publish in different journals should primarily be the focus of the journal. Some people I know enjoy the fact that they are published in widely different journals and some people may see that as your research being more widely accepted (right or wrong).