Should I live with my dad or stay with my mom?

So I'm in the 8th grade and I haven't decided who to stay with. Before I moved to this new school I had real friends and was kinda popular. I also lived with my extended family excluding my mom even though I was still in "her" custody but I did visit her every weekend. Then when my dad came back my sis and I saw him every other weekend as with my mom. After we moved to somewhere a little over an hour away, my sister and I had to live at my aunt's house. Ever since we've been in my mom's "care", I become unhealthy and more violent with my mother. Now I resent her and and regret about anything I did to her fearing bad thoughts. So if I move back to my dad's place, I'll be living with a stepmom and three much younger half siblings , but I'll get priveleges like friends, rats, a phone, and internet which I'm sure is viable for high school research, but if I stay with my mom I'll most likely be staying in a cramped, junky bedroom, and probaly get into more fights with her, which will sure not help our relationship. So I'm on the fence with this decision, should I live with my dad and be resented by my mom's family or live with my mom in an unhappy situation?