Greater Manchester is not one city. It is ten councils: Bolton, Bury, Manchester, Oldham, Rochdale, Salford, Stockport, Tameside, Trafford and Wigan. Each has its own town centre and its own habits.
The middle of Manchester is flats in Ancoats, the Northern Quarter and Deansgate, and much of that market is lettings.
Go out along the Metrolink or the M60 and you reach red-brick terraces in Salford and Oldham, semis in Stockport and Trafford, and bigger houses around Altrincham and Bramhall. Drive time shapes the work.
A crew stuck on the M60 at five o'clock loses the afternoon, so a small firm does better covering three boroughs well than ten badly.
Rightmove, Zoopla and OnTheMarket carry most property browsing, so an independent agent wins by showing it knows the street, with local pages and proof of work done nearby.