In reply to DerwentDiluted:
I don't see how Edinburgh can win unless you live on the absolute western outskirts. Having lived in gorbal/shawlands of Glasgow where you can be heading out north west pretty quickly, then over the bridge after the airport, versus Newhaven(alien rock area) in Edinburgh where it was a slow trudge just to get out of town.
Best location. Probably Stirling. Close enough to shoot into big city climbing walls, perfect position to head north up A9 or west, already north of the major traffic problems. The time saved getting out of the city means you can do quite a lot of stuff on day trips.