With the very limited info you supplied I would definitely go with the gas kicker. Depending on the size of your brothers boat 4,5,or 6 would be good for trolling. If your plan is to put it on another small boat sometimes then the 9.9 would probably be a better choice.
I have both a 24 volt electric and a gas kicker on my boat and use the gas kicker 98% of the time for trolling. I use the electric mostly for boat positioning etc. The gas is also a lot lighter than the electric as an electric has a number of heavy batteries as well as the motor.
I can troll for weeks with my gas motor while I am limited to a few hours with the electric. The electric will not get me back from the other side of the lake against the wind while this is not a problem with the gas kicker.
If you can tell us more about your brothers boat (size, weight, inboard or outboard, does it even have a transom, place to mount batteries, place to put a bow mount electric, etc) and what you mean by trolling we could be of more help.
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