Is the 2-7/8 in. x 3/4 in. x 10 ft. Galvanized Steel Eave Drip Flashing 3" flashing better than 1 1/2"?

This will depend on your needs.

This will depend on your needs. For the 3", the face dimension is 3” on the deck and 3” on the face. The SDWH has a 1-3/4” face and 2-7/8” on the deck. More coverage on the face, the SDWH tends to be used more on the rake.