OS upgrade for mid-2009 MacBook Pro
I work for a non-profit on a laptop donated to us by a local research lab. So the first thing to understand is that I have to find "the best way to make things work" even if it's not as advanced or high-powered as might be desirable in an ideal situation. That said:
I have been running OS 10.6.8 on a mid-2009 MacBookPro. As of now, the software companies are all pulling the software versions I can use on 10.6.8 so I have no choice but to upgrade my operating system.
My concern: Two years ago I updated a 2007 MacBookPro from 10.6.8 to 10.7 (Lion) and it died 3 weeks later. The tech at the Mac Genius Bar told me it was because the actual hardware -- the machine's hard drive -- was so old that the upgrade was too hard on it and burned it out. I understand that even if the hard drive doesn't burn out after an upgrade, the computer may run very slowly and for much the same reason (hardware stress). This would also be a problem.
Given all that, what is the best suggestion for the safest possible, workable OS upgrade I can put on my machine so I can stay in business? Can it likely handle 10.7, even though the hardware is nearly 7 years old? What about 10.8 or even 10.8.5?
I realize that the system specs say it can run even Yosemite. But I do not want to risk going that far, given my past disaster.
Thank you for any advice you can provide.
MacBook Pro, Mac OS X (10.6.8), mid-2009 machine