Android sits at both ends of the security scale. Normal consumer-grade security (on practically every Android handset) is appalling, and beaten into a shit sandwich by iOS*. At the other end, ultra-high security handsets are also Android, but very heavily customised. And you won't get one of those for less than 5 grand.
* Not talking about crackability by everybody's favourite TLA agencies; I'm talking about trivially easy to crack by miscreants with the barest minimum of knowledge.