A good strobotuner will show how well a guitar stays in tune up the neck.
Compensated saddles help most standard scale guitars, but there are enough variables to leave it open to argument forever. Depends on your guitar, set-up, materials, relief, style of compensation, and more.
I'm always experimenting with the tops of my saddles. Most of my Guilds are significantly better, for me, with a strongly compensated "b" string. But then the F-30 is straight as an arrow and folks love it. :?