I recently acquired a Late-2011 13" MacBook Pro. It's the base spec 2.4 i5/4GB RAM. It's been a while since I've been regularly using a Mac (currently have Chrome OS, Ubuntu and W10 machines) so I feel a bit out of the loop with what's best for this MBP. I'm planning on getting an SSD right away (and possibly more RAM). I currently use Samsung/Sandisk SSDs. Are there any incompatibilities I should know about? I was planning on either an OWC or Samsung drive. Anyone using the 860 Evo? It currently has El Capitan. Is there a consensus on what the "Best Mac OS" is for this machine? I have a Pixel 2 XL and TicWatch E (Android Wear watch) so I'm not too concerned about the newer features that tie in with Apple Watch/iPhone. I'm mostly looking for the best performance for the old hardware/compatibility with current software.