I'm looking for "the best" Apple OS for helping me in coding and testing cross-platform (Linux, W32, OSX) applications, written in C, C++, Python and similar (no fancy, new-fangled node.js or - horror of horrors - iApp foo).
The applications mostly deal with sound and images, so the system should be recent enough to support all the current multimedia frameworks.
The sole purpose of the system is development, though I intend to include it into a compile farm (GitLab-CI based).
For this purpose, I have secured a Macbook Pro 6,2 (mid-2010) that comes with Snow Leopard, and before I start right out, I'm thinking of upgrading the OS to a "current" version.
I'm a bit illiterate when it comes to OSX/macOS, but my impression is, that the recent releases are mainly targeted at iOS users, so I wonder whether I should upgrade to
Sierra or even
AFAICT, my hardware would support the upgrade, but I have no need for Siri, Nighshift of recent features of iTunes.
I haven't found any relevant information about the features relevant for developing on the system (including frameworks) those new releases bring with them.
So: what OSX/macOS version would you recommend for a Developer centric machine?