You need to decide how you're going to use the car. Are you driving around city streets cruising between stop lights? Are you ripping it up through the hills and curves pretending you're one of the world's top drivers? Are you driving through the countryside looking at all of God's creations causing traffic to back u behind you?
If you're in a position to get either I would tell you to get the bigger motor. You can drive it any way you want it and if you need the hp or the torque it'll be there if/when you need it. The 1915 is a great motor but it may not pull up a hill the way you want. With the 2332 you can pull the hill without having to shift between 3rd and 4th so much.