The Park Lane Hilton and LXR will be quieter as are in a residential area, Mayfair. Park Lane is always busy with traffic but never that busy with pedestrians. LXR is at Grosvenor Square. It will be reasonably busy Monday to Friday from 8am to 5pm as Mayfair also has a lot of offices, but is pretty dead otherwise. The Trafalgar is right in the heart of London at Trafalgar Square and is busy all the time. The Trafalgar has more amenities nearby like supermarkets, buses, shops etc. The Park Lane doesn't have that much nearby. The LXR will just have high end stores nearby, fancy coffee shops and restaurants.