My point is comparing their battery lives when they have the SIM in them. So, not which one lasted the longest yesterday, one with the SIM and one without, but rather comparing across time, how did the S21 (my current phone) fair today, versus how did the iPhone generally fair a few weeks ago when the SIM was in it. Not exactly scientific; just what I've observed and felt.
And the unscientific conclusion I've drawn is that the idle time is pretty similar between the iPhone 12 Pro and S21 Ultra, but the "active" radios-on SIM-in screen-being-used-all-day time definitely favors the S21 Ultra.
> I am only saying that back in 2017 -- when I finally lost patience with Android -- things were looking pretty bad for it and for me that was the tipping point that made go for iPhones.
You're 100% right; Android's track record has been pretty darn bad when it comes to standby time. But, I think its actually gotten a lot better. There are some reports that Samsung's Android flavors, specifically, are very aggressive when it comes to background app killing; that may be it (and, frankly, I don't notice any negative side-effects from it. if its happening, its transparent). Or maybe it was something more general in a later version of Android. Or maybe just huge batteries. But; something has changed.
I'll respond to your earlier post too, but this is actually the answer that I was looking for. The Android world was a very different place back in 2017. The best battery life that I got out of an Android back then was an LG G2. I think that it was competitive with the iPhone, but many other Android devices of the era were not.
A more objective test would be for both to have SIM, or both to not have a SIM. Then again, iPhones have objectively weaker batteries compared to a lot of Androids (as in, less mAh).
I am not claiming that there are no better Android devices nowadays btw; not at all. I'd be happy if the OEMs finally caught up with this nasty problem! I am only saying that back in 2017 -- when I finally lost patience with Android -- things were looking pretty bad for it and for me that was the tipping point that made go for iPhones.