If you don't have strong feelings one way or the other, you can always ask the vendor you're buying from what their preference is since they're the ones you're going to be dealing with if you get sent a fish weak enough to die from acclimation.
Alternatively, you can google what you think is right and click links until you find someone who agrees with your method
Alternatively, you can google what you think is right and click links until you find someone who agrees with your method