At&T to Cox?

I have cox panoramic wifi. I n my area it's good. I have a cell phone with AT&T and due for an upgrade but want to go down in mobile plan from $100 to their lowest $50 a month. I don't need alot of storage. Cox says they can give me a Samsung S25 for $90 upfront with new account, $40 a month for lower speed wifi and $86 per month on new Samsung s25. I have a Samsung A12 now and pay $100 a month to at&t. So..Cox phone and wifi $125 per month on new account or AT&T about the same (with upgrade)? Either way I'll save close to $100 a month going with just one service. company. What should I do?