I play both, and think witcher is better. Just because I think one is better, doesn't mean I can't play the other. That's like saying you aren't allowed to eat pork because you prefer chicken. You can prefer one but still enjoy both.
Buddy, it's not about the preference. It's about this odd tendency of a certain type of person to take the time to post on the destiny forum about another game being better. It's kinda weird and sad.
Let's go with your example... I like pork better than chicken, so what do I do? Well, I go to a chicken coop and eat a ham sandwich in the middle of all the chickens.
Just weird.