If they developed chadwick street it may be a more expensive build per m2 but asda wouldnt have to gift millions to the college.
The Trinity Street scheme looks expensive to develop but perhaps that could be moderated and as has been pointed out they would have an extra £13MILLION to put towards it which they wouldn't have to use to develop to the College. In fact if I was Mr ASDA it would seem like the obvious solution. It is surely more preferable than fighting a long battle with Marple & SMBC and one which they seem to be losing.
Let's get this clear: ASDA are not planning to
give the college anything - they are simply intending (subject to planning permission, of course) to buy the Hibbert Lane site off the college at its commercial valuation for retail use, and then build a supermarket on it. Speculating on the relative costs of the two sites is a highly specialised business, and way beyond my grasp, but I do know that one of the criteria for retail land valuations, for rent or purchase, is projected turnover, and the Holliss Vincent report puts the Hibbert Lane turnover at 21.6 million in 2017, compared with only 17.4 million for Chadwick Street. See
http://democracy.stockport.gov.uk/documents/s25234/FINAL%20Marple%20Foodstores%20Report%20-%2022%2001.pdf.
So by that criterion, and also because its gross area is smaller, the valuation of Chadwick should be lower. On the other hand, construction costs at Chadwick Street will be higher, and of course, there will be no revenue from fuel sales at Chadwick Street (that is not included in the Hollis Vincent figures, btw).
So it's hard to call - but you can bet that Asda are looking at it, of course!