I use a 136, but tbh, I want a Japonesque powder brush. I've tried those, and they're softer than my 136.
They have Japonesque brushes at Ulta, or at some Nordstroms they'll have a display. I have one of their travel-sized e/s fluff brushes, and it's actually softer than any of my MAC ones.
From now on, when I need new brushes, I'll probably just get Japonesque. They're slightly cheaper, WAY softer, and all of them come in regular or travel-size.
Whatever brush you decide on, make sure you get a good brush cleanser. I found MAC's didn't clean the brushes well at all (and yes, I was using it correctly), and it took ages to dry. Now, I use Cinema Secrets, which cleans and disinfects the brushes completely (and easily!), and takes minutes to dry.
If you're acne-prone, IMO, you should clean your face brushes like two three times a week.