@JasGot If you want to stay with Samsung then just download the Nova launcher app, if I understand your needs correctly. You basically make your own UI as much as you want to.
If you want a new manufacturer then I still recommend Huawei phones. Despite the political backlash against them they have been far more reliable and better built than anything I have used in the past. I have used apple, sony, lg, and samsung, and motorola phones in the past. They just never have software glitches. Their UI was fine to me but I always use Nova on everything anyway.
Now with google pulling breaking away from them that might complicate things a bit more which is understandable. However I will stay with them. Ive used them too long to go back to anyone else and I just never have issues. I am waiting for their equivalent of android to come out so I can finally leave google behind forever.