CANSail or cruising?
Whatever your goal, we recommend that your first sailing course is a CANSail course. A dinghy sailing course focuses on purely sailing. You will therefore finish a CANSail course with a deeper understanding of how to actually sail.
If you take basic cruising you will learn not spend as much time focussing on how to sail. You will instead learn the skills required to captain a larger boat. That means, navigation, seamanship, docking a larger boat, anchoring and the rules at sea.
After CANSail you can always take a course in a larger boat. You'll probably find it easier with your new found sailor skills!