New to PzC, what next?

[Liebchen]

Small question by the way, I can't find it anywhere:
what is the difference between the regular scenarios and the "a" HTH scenarios? I understand that this would mean they are better for playing against a real opponent, but what is different about them?

Not being a scenario designer, I can only make a stab at this, but I understand that the biggest difference between them, typically, would be in their objectives and in the freezing of units and their release times/conditions.