Dropbox or Amazon AWS for Streaming?

Hi, I am developing a membership site for my business. My coder said we can host some mp3 files to be streamed from within the member site on AWS or Dropbox. I'm moderately techy myself but can't seem to find some answers to something.

I don't mind paying for a solution so this isn't so much about that BUT if i can get it for free then that's pretty cool.

SO -- I've a number of mp3 files that will need to be played from behind the ClickFunnels Membership walls. BTW - ClickFunnels "lives" on Amazon servers. ClickFunnels does NOT host files bigger than 3mb. I have about 10% of my mp3 files exceeding 3mb. SO I have to host these files securely somewhere so my members can play them while working through my membership site.

What is the safest way to host them Amazon or Dropbox. I realize anything can be hacked I'm just trying to keep the honest honest. ALSO - when Dropbox says they host up to X GB... how does streaming impact that?

Lastly any educated opinions on what player my coder might do well with? I am paying him to figure this out I just figure I'd like another opinion or 2. AND I don't really get if Dropbox would be charging me for streams/bandwidth.

Thanks and your knowledge is worshipped !