Go with the bait tube
The trolling bait tank thing is ok
if you want a really slow troll or to help slow your drift
The only thing good about it is that you can pull it out of the water and stow
it on deck with live bait in it when you make a move.
If you leave it in the water while making a move it will cause a hard pull to
that side.
here some info on the bait tube
http://www.plasticnavy.com/bait-tube.htm