Well, I can't remember the last time I saw an update to my Note 4 before I finally gave up on it. I waited for months before getting Lollipop then there was the FB issue and the camera lag and inability to focus that finally just killed it for me. I can't tell you how many pictures I missed.
I don't remember having an issue with safari links. The only issue I had with 9.3 was that 9.3.1 caused an odd battery discharge that I narrowed down to Siri.
Beyond that, no issues.
Going back in time, there hasn't been one single upgrade that has caused me the hassles on iOS that I've experienced on Samsung upgrades. To the point that I pushed my IT department into an early upgrade so I could get out of my SGS5 and into an iPhone 6, which has been running without one single issue.
And my security update for March isn't here yet.
The folks at Android Central are also not seeing monthly updates.
http://m.androidcentral.com/samsung-announces-its-latest-security-update-question-when-youll-see-it
Yet an update was released for Nexus phones in April.
https://source.android.com/security/bulletin/2016-04-02.html
So the security updates are following a monthly cadence on Nexus, not Samsung devices.
The cadence for iPhone security updates seems to be around two months. I'm fine with that.
https://support.apple.com/en-us/HT201222
I've never had any security concerns with any Apple product I've owned.