As I bring them inside to take photographs, most are scented. Few aren't.
It was the strongly scented aspect I was interested in i.e. detectable scent outside.
From the garden worthy aspect, a scented plant in garden needs to detectable on the breeze I feel.
Good winter scented shrubs like Sarcococca confusa, Chimonanthus praecox, Viburnum x bodnantense 'Dawn', Lonicera x purpusii
all waft round the garden and S. Arnott also does given a big enough drift.