Definitely go for a brushless motor. Brushless motors are the standard for ebikes these days. Brushes wear out so you don't want to have to keep on replacing brushes all the time.
A Brushless Motor is by far better and a Direct Drive Motor is better than the Geared Brushless Motor BUT, go for a voltage of 48-60 volts
plus as much battery amperage/ratings you can get. Going with that kind of hardware requires a sturdy frame and not a bicycle frame but
a moped style of frame. Most of those choices matter with what you are going to do with a Ebike and is a matter of preference. Commuting
in a city or riding a good bicycle frame is ok but for range of 7-30 miles a moped style is by far more comfortable to ride with full-suspension.