The DS4 looks far more durable. The seems are tighter, the triggers finally look better than the Xbox's controller, and the fact that it looks more slim just looks nicer on the eyes. I never did care for that fat Xbox 1 look. Only thing I don't like about the DS4 is that stupid ugly pointless touch pad.
Honestly I'm not worried at all about what it will look like. I'm worried what it will play like. I sure hope they don't streamline it even more so. It would tickle me pink if they brought back some inventory management.
I liked the music in D2 far far more than D1. D3 music was such a massive disappointment. Oh and you were most likely a little kid when you played D1, hence the shat when seeing the butcher.