I'm a mixture of the two. All of my stuffed animals from when I was a kid are still in boxes in my parent's basement. My mom wants me to throw them away, but I can't because my little sister and I used to play with them all the time and they all had names and personalities. If it has sentiment to me, I have a hard time parting with it even if I haven't touched it in years. If it's junk (usually electronic stuff, clothes, things like that) I toss or give it away.
My little sister and I also have a bunch of stuffed animals in the basement that we can't bring ourselves to get rid of. We had so many special memories as kids with those toys. Only the two of us could understand who they are and what they represented to us. I can't imagine throwing them away (even though it's a bit embarassing that I still have them, since I'm supposed to be all grown up.)
I live in a very cluttered house. It's a bad cycle, since my mom grew up in a messy house that never really stayed clean. My house is old, and a fixer upper, but it's all my parents could afford, so my dad, being the handy man he is, decided to try to fix it up, so he gradually bought various building supplies home like wood, tools, furniture, drywall etc. Unfortunately, he works so often and so hard all day, he doesn't have much time or energy to actually finish any of the projects, so we're left with a lot of stuff that just sits there unused. It's a very stressful environment, and we keep trying to come up with ways to keep the clutter under control, but they eventually fail due to exhaustion and frustration. 6 people in a small house doesn't help either, since we all contribute with our own stuff. It's not really hoarding, but it gives me somewhat of an idea of what that environment might look like.
I like orderly, but not perfect environments. I can't have everything perfectly in line, or it feels too lifeless. I do get rid of anything I don't have a sentimental attachment with, like clothes, electronics, old drawings etc., and throwing those kinds of things out feels so good. I made a promise to myself that I will never live in a cluttered home, and I hope I can shake the 'messy gene'. I'll probably go with a kind of mimimalist lifestyle, where I can still be eclectic, but in a very clean and modest way.