That's very impressive for both phones, I appreciate the sammy is waterproof but I'd be surprised if the warranty covers being hacked out of block of ice after 10 hours.
The pixels waterproofing is more than enough for me (clearly tempting fate now, I'm bound to drop my phone in a vat of acid) - I do use my phone in the rain from time to time (Nexus 5X) and the pixel is more water resistant than that so it should be fine for any sensible use.
And it's nice to know that if I do drop my phone in a shallow pond, and it then freezes over, and I forget to dig it out until the folowing morning it'll probably still be alright.