FWIW:
Android mobile users facing increased security risks, security provider warns
My personal feeling is that Apple is more secure; hardware and software are designed and controlled by Apple to work seamlessly together. On the other hand, Android is open. There are around 300 different models of phones listed on this forum. Even if two models have the same Android OS version, they may or may not have the same features. Each manufacturer puts in their own tweaks to try and differentiate their phone from their competitors. Because of these tweaks, even when the Android OS is updated in the open community, the phone manufacturer has to do a lot of work to make the update work on their phone, if at all. My phone is an LG Shine Plus which shipped with 2.1. In November, LG came out with a 2.3.3 update for this model. It has failed miserably, causing many problems (go to the phone forum and see for yourself); LG has since pulled the update from its support. Based upon this, I am afraid there is a greater chance that security may be compromised with Android.