Personally I do not like Sketch UP. Because it looks for me like stack of different stuff without single conception.
But MOI on the contrary has solid concept and already have all necessary tools.
Quote.
Some colleagues of mine use it, they often have to deal with geometry that gets corrupted after some edits, and remake the model from scratch everytime. Not a consistent workflow.
Say what you want about SU - it's inferences and speed still make it a nifty program, especially for extrusion based output. It's failures definitely exist in it's plugin UI.
Having said that - as soon as MoI gains some component type functions - I'm off!