I like my Logitech M570 Wireless Trackball Mouse. Been using this style since Logitech TrackMan Marble Wheel first came out about 1995.
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I agree about the trackball, I’ve been using them since they first came out. I keep a couple of spares around in case Logitech decides it’s time to stop making them. 
The wireless Logitech keyboards and mice are excellent. I have been using them for at least 12 years. Batteries last seemingly forever. The keyboards are reasonably quiet and the mice are comfortable. Short of buying an expensive clicky keyboard, there is nothing better.
There’s two different MK540 keyboards pictured - is the one that ships with a single-height or double-height return key?