The ’20 has usb charging, too. 2-stage side-clicky, usb charging, the works. Only that the i332 has a tail-clicky for on/off and side-switch for modes, whereas the ’20 has the 2-stage switch for everything. So that might add a little bit, but… 
The i332 is a good general-purpose EDC if you mostly leave it on its brightest setting, but really like momentary-on for a quick flash’n’dash. I rarely if ever step it down when I’m using it (around the house). No memory, resets to high. Which is the exact opposite of, say, a Jet-II, which also has nomem but defaults to low, for when you don’t want to get blinded late at night when you’re not sure what mode you last left it. 
Frankly, I really like the style of the i332 (it’s all Star-Tracky!), but I was wowed by the compactness of the ’20. And I think the regular ’20 is even a bit shorter, too! I’ll see soon enough… 