Tollcross is a good course, I've ran it a few times. Quite hilly though, I found it tougher than both Pollok and Springburn (I haven't been to Victoria Park yet). You start at the bottom of a fairly steep hill at Tollcross and there are a couple of other hills in the route. It's quieter than Pollok and Victoria, with usually 80-100 people going. Lovely crowd though, I really enjoy going. You should definitely try it