[Closed] point of sale apps....

Anyone use point of sale apps?

I am due a phone upgrade soon, and thinking of getting a Iphone (or even a android) so looking at apps to help with the biz.

Was just looking at stock contol apps as the main thing I need is some sort of stock control, levels how many sold etc, like
http://itunes.apple.com/GB/app/id492472375?mt=8&affId=2157527

But I come across the POS apps and some seem to cover the stock side plus a lot more which would be handy when I am at events/races etc.

I do find the apple website hard to seach but found,
http://itunes.apple.com/us/app/cashier/id502593329?ls=1&mt=8

Also i found this list of apps but looks like they more about taking card payments, (which would be handy as well)
http://appadvice.com/appguides/show/point-of-sale-apps

Android app
https://play.google.com/store/apps/details?id=com.krugism.registroid&feature=more_from_developer#?t=W251bGwsMSwxLDEwMiwiY29tLmtydWdpc20ucmVnaXN0cm9pZCJd

So what have you used? good or bad. android or Iphone
Don't mind paying a one off fee for an app if it is good.

Thanks