Both volume and width play a role in the ease of uphauling. The two examples you provide above would be about the same to uphaul. At your weight, a board at 100 liters starts to go under water. At 120 liters, the board has plenty of float, but if you don't get your feet in the correct place to uphaul, the nose, tail or sides may begin to sink a little. At 100 liters, the sinking is significant of you get out of place. A 130 liter board is a little more forgiving than a 120 liter board if your feet aren't in the correct location for uphauling.
The width helps a little if the water is choppy and there are swells because wide = stability for uphauling if there is a lot of board movement. However, you won't notice any difference in two boards that are just 2 cm apart in width.
Wider is also easier for getting into the straps if they aren't too far out on the edge (rail) of the board. But again, a 2 cm difference won't be noticed.
When learning to use foot straps, be sure that they are set in the holes closest to the center line of the board. When your skills improve (a year or two), you will want to move them to the holes nearer the rails (outside edge) for better leverage with larger sails.