Over a period of 365 days per year, summer, autumn, winter and spring, dry and rainy, hot and cold, windy or calm, it's touch and go probably, providing that is the heathland is genuinely sandy and free draining. Variety is nice however.
One plus for links courses though, is that they are generally in nice parts of the countryside, many being very rural, whereas many heathland are near urban areas.
Atb