Hardshell jacket sizing typically takes into account that they are meant to be worn over active insulation, and will most often reflect the jacket size you most typically wear in outerwear. Sizing up a hardshell jacket can be an attractive option for those who require more protection, such as skiers, but for alpine climbers and mountaineers, this will often make for excess material.
Some manufacturers have earned a reputation for a specific type of fit, though we would warn against making broad assumptions when deciding on a hardshell based on these alone. Arc’teryx often produces jackets with a trimmer alpine fit, while jackets from Patagonia are a bit boxier. European brands such as Ortovox and Rab also tend to be a bit slimmer.