as you already decided that you need quick and easy way of doing renders it would be tricky to replace Keyshot.
But as soon as you start to think about doing some more complex things you’ll discover it’s shortcomings.
In my workshop I use Modo for rendering. It has awesome rendering engine (but it’s not point and click solution ) and more importantly it’s super cool modeling and animation package. For me choosing it was a no brainer - for a price of Keyshot I got a package that is capable of doing much more.
But again it depends on how deep you’re willing to dive in - if you don’t want to spend time learning render settings stick to Keyshot.