Updates. Updates, updates, updates.
I've come to trust Apple. Why? Because my iPad 2 still gets OS and security updates. Because my iPhone 5s still gets OS and security updates.
Apple has demonstrated that they support their tablets and phones at least 4 or 5 years. That's why I'll buy another Apple tablet. That's why I'll buy another Apple phone.
Why would I buy an Android phone or tablet that's unsupported and abandoned after less than two years in many cases? Where security updates (think Stagefright) take months and months to get patched, if they ever get patched at all on your device? Android devices simply aren't safe.
Even the Nexus devices can't compete with Apple on longevity of support.
Android manufacturers could convince me to try their products if they'd simply patch them in a reasonable time and update them for a reasonable amount of time. I would define reasonable as at least 4 full years after purchase. For that, I'd pay Apple like premiums.
Until that time comes, my only viable option is Apple.