I have both the Android and IOS applications for mobile bitcoin transactions and I have to say that I like the android version better.  The IOS is almost as good, I just do not like the format and it seems more difficult for me to use.  This just my opinion, but I am going to vote for Android.

Neither.

i suggset to use laptop for transactions:) well may be sometimes through android

I like android for every transaction coz this is the only gadget i have. I dont have ios or even my own laptop it would be risky if I use computer in a net shop.