When I took bike mechanic training at UBI, every work station was equipped with Felco C7 cable cutters which we used to cut cables and also shift housing. For brake housing we used 8” Klein high-leverage diagonal cutters, model D288-8. Probably the best price for Felco C7 cutters is the Pruner Warehouse: https://www.theprunerwarehouse.com/f...le-cutter.html
They offer free shipping.
Description of the high leverage Klein diagonal cutters is here.
https://www.kleintools.com/catalog/d...everage-8-inch
Other manufacturers offer high leverage diagonal cutters.

Park Tool describes the use of diagonal cutters on brake housing:
https://www.parktool.com/en-us/blog/...tion-drop-bars