Well we can't see their skills, so it is kind of hard to give training advice but 1v1 for forwards trains Jump Shot, Handling, Driving and Inside Shot so I personally find it very useful. However, since you are training two big guys (6'10" and 7'2") I would recommend training their inside skills first, unless they have very bad secondaries.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs