Hi I’m from london,
I don’t know loads about Manchester but I do know it’s a very relaxed place. Housing is MUCH cheaper then in London.
Salford is the older area and more heimish and chasidish
Prestwich is where a lot of younger people move to because housing is even cheaper than salford and it’s more litvish and modern (whatever modern means)
Shuls there are loads it depends what style you are looking for litvish, heimish, chasidish or modern.
Schools I don’t know anything about
Good luck with whatever you decide.