I love Buffer because unlike HootSuite, the user experience is beautiful and easy to navigate.
There are ways that Buffer could improve - like allowing you to view multiple account calendars at one time (in Buffer's "Awesome" plan). Currently you can only view one calendar at a time.
Invest in the paid version! The free version is nice, but if you are a social media manager, you will pull your hair out with its limited options. I finally put out the $10 per month (not expensive at all) for the "Awesome" plan and it really is fantastic.
I am a freelance social media manager, so I needed a scheduler that did not cost an arm and a leg but still offered a great experience and lots of options.