We get a lot of these small business iPads in when they break (I run a chain of computer/phone/tablet repair shops.) When I get a chance to talk with customers, they mostly pick iPad because they know and are comfortable with iOS.

Or they literally don't realize there's any other tablet out there--other than Kindle Fire, which in their mind doesn't run small business apps.

People associate Kindle Fires with "cheap tablet for their kids." And cheap they are--when they break, it's actually cheaper to buy a new one than to replace a cracked screen on an existing one.

I've met people that were scared of Square as it "didn't look like a genuine POS".

I guess using an iPad could make the consumer feel safer. Than again a "Pro" looking case for the Android tablet might also do the trick.

If I didn't know what Square was I'd be suspicious too.

Swiping your credit card into a dongle attached to the audio jack of an iPhone/iPad. Seems legit.