Personally I'm not a fan of third-party, extended warranty services but since you are interested in buying it for your phone all I can suggest is you read through the documentation for both Samsung Care and SquareTrade and go with the one that best suits your particular needs. Both are major brands with a history and a lot of customers so that's a plus. If you're looking for any service without complaints, that's just not going to happen. Along with those who did encounter actual problems, there's also now a prevalence of just mindless rants and trolls that pollute every online comment site. The Internet has devolved into a massive mix of good and bad info so finding the good is a more about applying judgement skills cranked all the way up and still expecting to make the wrong choices on occasion. If anything, take those Reddit criticisms into consideration but don't pick one or the other because of that some anonymous postings tell you what to do, pick the one that you feel the most comfortable using. It's your credit card that'll be involved in the end.
Just curious if you kept your S20 FE in a case or not. Also, even if you always handled it with care, did you perhaps transport it around with you in a pants pocket or something like that? The bending matter sounds like there's more detailed backstory we're missing out on.