Cellphones are one of the few things I wouldn't insure, unless it was extremely cheap. So lets say you use your phone for 2 years, Samsung insurance costs what, 130$, + $160 for a device swap, and it only covers three swaps. Most protection plans don't cover water damage, so the most you would ever get replaced is an LCD. A galaxy S7 LCD is $150ish- $200ish.
If you really want to get insurance, I would get it from Samsung, just because you know they will use OEM parts for their repairs.
I have never had any luck cashing in on any of my protection plans, I paid $200 for a device, I needed a charging port replaced, and they wanted $99. Now that I repair phones, I know how much of a rip off that is. I can replace a charging port in under 15 minutes, and it will cost me about $3 in parts. (Not just replacing the assembly, I re-solder the port.)