I'm a programmer more than a gamer. I have a fondness for wireless & free scrolling mice. I'm currently using a Logitech m560 which is okay, but the balance is

I'm a programmer more than a gamer. I have a fondness for wireless & free scrolling mice. I'm currently using a Logitech m560 which is okay, but the balance is off. I'm looking to upgrade too. My contenders are the new Logitech MX Master ( http://www.logitech.com/en-us/product/mx-master?crid=7 http://www.logitech.com/en-us/product/mx-master?crid=7 ) and the Marathon m705. i prefer smaller, so I'm leaning towards the m705.