Personally, all three of the motorized bikes I've built had only rear coaster brakes. Not the best set up, however, I do live waaaay out in the boonies and don't have a lot of riding where I couldn't just coast to a stop.
I realize a lot of you ride in the city or more congested areas where good brakes are more than just a good idea.
I'll be the first to admit I know nothing about bike brakes except the cable pull type and some of the variations of those, and coaster brakes.
Pad types?
Brake types?
Disc?