What is the difference between sertide diskus and evohaler? what a is the advantage of each other?

Medication delivery: The "evohaler" is a metered dose inhalers (MDIs), while the "diskus" is a dry powder inhalers (DPIs). MDI typically rely on the patient coordinating breathing and pushing the canister down. DPIs are a group of inhalers that have the medication in very fine dry powder, delivered by breathing in. You can find more information at: http://use-inhalers.com/comparative-studies-on-mdi-and-dpi