I teach three ways to field slow rollers:
1. Two Hands
2. One Hand
3. Bare hand (for slow rollers hugging the ground)
I feel two hands is better for the more my shorter players. IMO, they are both about equal in quickness.
The two handed method involes one less step, but won't get as much on the throw.
The one hand method takes one extra step, but fielders seem to get more on the throw with the extra momentum.
It is mostly a matter of what the fielder feels the most comfortable with.