Advantage of Appium over Squish

Can anyone let me know what are major advantages of using Appium over Squish?
I really require this to know.

Appium does not cost over 3000EUR per year. I could not really compare other attributes, because I never used Squish.

I understand that is the main reason but our client is asking for reasons apart from cost why we should move from Squish to Appium.

should you move from Squish to Appium?

Yes we should move from Squish to Appium but few reasons will be helpful apart from cost

Refer this :