Celsius?

How does Celsius stack up against Alani, C4 Smart, Ghost, etc? I’ve had friends recommend it but haven’t been wanting to spent $4 on a can when Alanis and C4 Smarts are $5 for 2.

My go-tos (if it matters) Pink Slush and Cherry Twist from Alani Strawberry Guava and Tropical Passionfruit from C4 Tropical Mango, Electric Limeade and Cherry Limeade from Ghost