Best OS version for mid-2010 MacBook Pro 15-inch?

What is the most responsive, efficient, best OS version for a mid-2010 MacBook Pro 15-inch I have been given?

• Mac OS X 10.6 Snow Leopard was released on August 28, 2009.
• Mac OS X 10.7 Lion was released on July 20, 2011.
• OS X 10.8 Mountain Lion was released on July 25, 2012
• OS X 10.9 Mavericks was released on October 22, 2013.

From Mactracker App: Introduced in April 2010, The MacBook Pro (15-inch, Mid 2010) was primarily a speed-bump of the The MacBook Pro (15-inch, Mid 2009). Improvements included faster processors, improved graphics chipsets, and larger hard disks for the low- and mid-range models. The MacBook Pro (15-inch, Mid 2010) shipped in three configurations: 2.4 GHz Core i5/4 GB RAM/320 GB HD/$1799 U.S., 2.53 GHz Core i5/4 GB RAM/500 GB HD/$1999 U.S., and 2.8 GHz Core i7/4 GB RAM/500 GB HD/$2199 U.S. Built-to-order options included a 500 GB 7200 RPM hard drive, a 128, 256, or 512 GB solid-state drive, a 1680x1050 glossy or anti-glare display.

Original OS: Mac OS X 10.6

Maximum OS: 10.13

Many thanks for your time.

Michael