What shrub should I consider for hedging or screening?

Hedging

Infers rather formal pruning, flat tops. Doesn’t necessarily refer to short or tall.

Alpine Currant

Boxwood

Yew

Compact Burning Bush

Peking Cotoneaster

Privet 

Screening

Suggests more informal pruning than hedging, still somewhat uniform in width, with pruning at top for consistency and neatness of height. Generally suggests taller, 6-7’ or more.

Arborvitae

Arrowwood Viburnum

‘Mohican’ Viburnum

Upright Juniper

Privet

Cornelian Cherry Dogwood

Columnar Hornbeam

Columnar Oak

Yew