I've worked on both but at my age I think the monkey boards are a thing of the past! How many of the "drilling experts" here do you think can ID both much less worked on both?
It sort of surprises me, how many parts of a rig Sound Dirty But Aren’t.
Kelly bushing, shale shaker, choke manifold ...
And I won’t even get into the dog house and the mouse hole!
I believe they still use monkey boards even though most larger rigs now are top drives. The pipe has to be stacked somewhere. Some of the newer rigs are called Super Singles that don’t break the pipe off in stands but in individual joints that are stacked in a box on the catwalk.