G'day Vanya,
Having built a number of boats over the years, I'm still a fan of Brushed motors where you don't need them to scream like a Banshee. The Brushless are fine in fast boats, but in the slower work boats I feel the Brushed motors have the edge. They are quiet, economical to run, and you can often find suitable small motors on car electric aerials from the scrap yard. You can also buy them cheap on Ebay.
You can read of some issues I had on my Albert build, where I started with a Brushless, but soon changed after my lady hated the noise of that motor to the point where she didn't want to run the boat, until I refitted Albert with a 50mm Brushed motor out of my vast collecion of 12v motors, which all came from cars, either aerial or fan motors. Albert now runs silently and performs just as he should!
Ian.