My friends also recommended Alliston for us as there's way more options up there compared to here...When we were looking for more space, adding 200k in the same neighbourhood got us one more bedroom and one for garage. It was not good value for money imo. Moving north made a big difference. Obviously we are lucky and don't need to be in gta daily, that would be hell from up here.
But while we love them, we hate going up there as it's 1-1.5hrs for a visit. Plus the fact I'm so close to my parents now (10km) I wouldn't want to be far away from them in their older years as they're early 70s already.
Fun fact...my drive to work would be 10km closer from Alliston to Scarborough than Mississauga to Scarborough.

