It's absurd to place so much value on the number of people you've slept with either way, I don't think a judgement of character should be made based on something so trivial
I don't think having sex with hundreds, or even thousands, of people is trivial to be honest. It's not "the norm" and does say something about the person's character - whatever that thing is and whether you view that something positively or negatively is completely up to you perspective, but it's simply not true to think that someone who chooses to be a virgin their whole life, or chooses to have sex with many people is doing something that most other people do and is therefore doing something that doesn't merit at least an "ah, ok, interesting, I wonder..." response.
Someone who has been in 3 or 4 long term relationships is going to have had a lot more and better sex than someone shagging random people imo
That's right for you, presumably because you're the kind of person who lets themselves go a lot more when with someone they know and trust, but it's not right for everyone. If a big part of your enjoyment of sex is the chase, the unknown thrill etc. - irrespective of who you're doing it with or even whether you orgasm - then you are not going to be getting "better sex" in an LTR than you are shagging a random.