Which MAcOS for a MBP 15" Mid-2009?

I retrieved my old MBP which is still working fine... well, given the available performances even though maxed out at the time. Obviously, running El Capitan most web sites doesn't run properly or don't work at all.

I tried to understand by myself to which OS I coud upgrade my MBP on the website, but seems I couldn't install any which is still really supported or workable, meaning I wouldn't really fix my web-site issue.

Can someone, please, help me understand to which release I can actually upgrade my MBP without serious limitations (I'll need for sure WiFi and BT to work) and if this would be worth the effort?

Thanks!!!

submitted by /u/LukeDuke74
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