In case of performance for multithreaded applications, development (Java) and virtualization (Parallels 11), what's better - upgrading to 10.9 Mavericks or El Captain? (or Yosemite) ?
Now I'm on 10.8.5, MacBook Pro 15", i7-2.0x4, on SSD with 16GB RAM
P.S. upgrading needed as Parallels 11 doesn't support 10.8