Is it worth it for me to get an MFE ?

Background about me:

I started as a software engineer at a BB this year, but after learning more about the industry I would be more interested down the road as a trader. I'm not sure though if I can make the switch internally, and I've been wondering if an MFE is a good investment. I had interviews at prop shops (DRW/CTC/3Red) but essentially got trashed on the on-sites because I failed to prepare adequately. I also looked at the pedigree of the trading analysts at my bank and their caliber in math/quantitative finance doesn't seem to be anything stellar. With that in mind, is it a good investment to get an MFE? I am thinking about going for the CFA to enhance my finance knowledge, but it isn't going to build my quantitative knowledge. I also had done one of those online quant competitions (like Trexquant) and performed enough to get a part-time offer, but I already started working so I cannot accept or put it as work experience. I definitely find what I struggle with is insecurity, which is probably not a desirable trait for a trader. With that, there are a few points I would like to have addressed:

• What makes a trader successful and will the MFE distinguish me when compared to undergraduate trading analysts?

-Would MFE help more for buyside/sellside trading? What traits distinguish the two? I notice that more MFE's get hired to sell-side trading

• Is it just better off for me to get an MBA? From what I know, computer science majors are definitely seen as a more positive. A good MBA more than likely also has a higher salary than a top MFE. I often see people in quantitative finance switch over to startups.

• Would credit, risk, or structuring be a better career path for me? What I am concerned about is that companies can hire quants at the PhD level, but as a trader if I improve my quick-thinking skills/insecurity then I possibly might make more of an impact as a trader.