Xfinity Pro Upgrade question

I see there is a better system out now from what I have, and it appears to be the same cost as what I am paying now? Or is it an additional $15mo to what I am paying now? I have two wifi extenders that continually drop signal which is annoying when trying to do classes, I really didn't think I'd need them with how small out house is. But I hope the Wifi6 will improve things. Anyway, if it is the same cost it'd be awesome to upgrade, if it is more then I'll look at something else since I feel I'm paying a lot for what I have now.