Plasticity is definitely on my to buy list.
For what I do Moi is used probably 95% of the time in addition to other software.

For instance I use Vectric vcarve and it has its drawing tools...but I draw in Moi and then send to vcarve since it is way faster for me.
One thing I wish Moi had is a distort tool > https://www.youtube.com/watch?v=-94OrLae_nY