Moving to the City of Salford stadium is a great move for the club. I used to play for Sale when at Heywood Rd and as cosy as it was, it was never a good location for a pro club. I've never been to Stockport but I believe the facilities were shocking.
Combining assets with Salford City Reds makes sense for both clubs. Plus a lot of Union support is in Cheshire & the location of the new ground can tap into this a lot easier than before. It's also close to the Trafford Centre so some clever marketing could attract a new audience from there