Capt Larry uses a smaller boat then Princess will use. Capt Larry's boat does have a washroom on it, though it is small, and Capt Larry does provide beverages, such as juice and water, and also provides a snack, mainly smoked salmon crackers and cheese.
Capt Larry does have a platform ontop of his boat that he does allow 6 people on while watching whales for a higher up view. He only asks that you allow others a turn. He also has room to stand outside on the back of the boat. If you wish you can stay inside the boat in seats with tables. Capt Larry also provide binoculars if you did not bring your own.
Princess will try to fill their whale watch tour so that the boat is full if possible, Capt Larry will not fill his boat so people have a little more room to move. Capt Larry's boat is somewhat faster than the boat that Princess will use so it can get to whales faster or travel farther in the time alloted then Princess tours, if necessary.