There are many boats the shore —some large, some small; some strong, some feeble; some beautiful, some not; some full, some almost empty; some rich, some poor; some sea-worthy, some not; some propelled by rowing, some by sail…
So are the schools of Dharma: they have a captain, a crew, and a shape. Check out the captain, inspect the crew, see if the structure of the boat is sound.
An experienced captain might tell you of a place you had never considered as a destination.
When you choose a boat, you must first ask where it is going. Not all are going where you may want to go, and some will not go the distance.
Once on board, it is dangerous to attempt to jump onto another boat.
Sometimes, however, if the boat makes water, you must jump.
Have no fear, there are life-savers!