...but the control you have in After Effects is greater.
I love Motion...for certain things. I use Motion and all it's content as sort of a "plug-in" for After Effects. I create particle elements / animations in Motion with alpha channels that I composite in AE. In these examples, the smoke FX on Jimmie Johnson's spinout at the end of these videos was done in Motion. I brought it in to AE and composited it with an animated still of a birds eye render of JJ's car:
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kartracing.easports.com]
When life gives you dilemmas...make dilemmanade.