I voted for canals.
I replayed them the most.
But, I liked all of the tracks.
The least favorite of mine were the gravel pits though.
If there was a choice, I would have voted for 'multiple track'.
IE: Tracks that had elements of all the maps.
Some water, some dirt, some pavement, some forest.
But, I think FO 1/2 did a great job at having diverse maps.
It was fun driving in all kinds of different situations, be it snow, water, sand, dirt, or pavement.
I wouldnt change the formula at all as far as track diversity goes.