Have you tried clearing your cached data? Samsung definitely has bloatware, but it shouldn't be holding back your storage that badly. Typically when people experience this and they feel they've deleted apps and pictures/videos, it's because the cached data needs to be dumped. Essentially if you use messaging apps and people send you pics and whatnot, all that gets downloaded and stored somewhere else, your cache for what ever app you are using. In samsung, you can go to your storage and find it and clear it. (I think I cleared 5GB of data recently from the cache)
From my understanding, the Samsung S8 is the best phone on the market at the moment since it's the newest. I've heard good things about the Pixel though (and yes, it doesn't have that bloatware).