12020 or 9920 for E-hyper 7?

[sleebus.jones]

I'm gonna get one of these, just not sure exactly which one to get. I don't want to get the 12020 if it's just excess capacity that I don't need. I've got a fiegao 10L on it now, and I intend to run it with 4S - 5S.

I'm pretty sure the 9920 will fill the bill. However, I don't know exactly how "fragile" they are. Do I really need the extra current handling capacity of the 12020 to keep from letting the smoke out?

Also, bypassing the internal BEC with these is pretty much a given, isn't it?

Thanks for any help,
Sleeb