You obviously didn't bother to take the time to READ my post. I said an open source system will be more secure than a closed source system. This is absolutely 100% true if all else is equal. However, in my previous post, I clearly stated WHY Android is less secure, even though, as an open source system, it should be MORE secure. Android is far more permissive of changes and customizations to the OS, which is great for the user, and terrible for security, and it's highly fragmented with slow updates. That's why Android is less secure than iOS in reality, even though open source software is more secure, all else being equal.
If you had bothered to read my post, you would see I specifically mentioned the update issues, and other things. However, open source would be more secure than closed source all else being equal (which in this case, it's clearly not).
Again, if you had read my post, you would see that I am not a fan of either, and while I lean Android, you could selectively quote me to be a fan of either one.
Most people don't go to Def Con. I hope to go some day, and if I do, I won't be bringing an Android device with everything enabled. Or an Android device at all. I'll probably have an iPhone with minimal apps, and then factory reset it when I get home, and have Bluetooth and Wi-Fi turned off, and only use LTE. Also, same thing for China. Heck, I'm kinda paranoid about going to DC next week with two Android phones, they're probably both going to get stingray'ed, but at least there, they're trying to intercept the traffic itself, not install something on the device. My traffic is not that interesting, and AT&T probably feeds it to the government anyway.
In this case, because of Android's method of software distribution and customization, you are forced to give up Open Source for security, even though that's sort of backwards, as normally, the Open Source option is the more secure option. Of course there are other trade-offs. iPhones usually "just work", Android phones "just work" until they don't, of which the latter seems to occur fairly often. However, I'm not sure that Closed vs. Open Source really means much relative to Android, as it's not like a project where many people contribute, Google just does whatever Google wants, and then eventually puts the source code out there. The big downside that I see is that other manufacturers, like Samsung and LG, are allowed to take Android, heavily modify it, and then put it out there, with relatively slow updates. Samsung has gotten better, but they still take way longer than Apple, who pushes updates out to everyone with iPhones that are now ancient all in one day.