SPG hotels are those that previously operated under the Starwood Hotels and Resorts, which was acquired and assimilated into Marriott. The loyalty program (Starwood Preferred Guest - SPG) was merged into what is now Bonvoy. SPG hotels have mostly retained their vibe and style under Marriott, with most changes occurring in the back-office. SPG members had a
strong affinity for their hotels. Fortunately you can still exercise this preference, as the SPG hotels have retained their prior brands (and personalities, even though systems have been standardised) of: St Regis, The Luxury Collection,
W Hotels, Westin Hotels & Resorts, Le Meridien, Sheraton Hotels & Resorts, Four Points by Sheraton, Aloft Hotels, and ment Hotels.