Short Answer:
Top brands for luxury smart homes include Lutron (lighting, control, and motorized shades), DMF, Savant (automation), Ubiquiti (network and surveillance) and Crestron (automation), and high-end audio/video manufacturers.

Common Stack:

• Lutron (lighting + shades)
• Ketra (special lighting areas such as rooms with walls of windows, art or sculptural galleries, speakeasies, wine cellars, etc.)
• Savant / Crestron Home (home automation systems)
• Sony / Samsung (video)
• Sonance / JBL (audio)
• Ubiquiti (network / surveillance)