I would go bigger.
Ours is small because it needs to fit in our "tender garage" at the back of the
boat.
It's a great system, I can launch the
dinghy with
outboard in less than a minute, but it does limit us to small dingy.
The small model does have the advantage my wife can pull it up on the beach on her own, with
outboard. (I tend to
cruise out of the way places and the only landing area, generally, is a beach) which would not be possible with a larger heavier model.
In all other aspects bigger is better.
I checked mine and it is a TL240. We can just get 4 in, but only if they they are not overweight and its calm conditions.
Three is its realistic limit.