Pros and cons of publishing in a journal not indexed in SCI but under ESCI?
I'm guessing that where you are in your career it matters very little. The important thing is to get published in a reputable journal. I also doubt that experienced scholars worry very little about such things. 

Pick a journal that seems appropriate for your work. Send it off. Then write the next paper. 

And if you are not yet in a doctoral program, then publishing is a big win, no matter where, as long as the journal is reputable.