Los Angeles is the SECOND largest city in the United States in terms of population. San Diego is the EIGHTH largest city in the United States.
San Diego - about 1.4 million (2020) Los Angeles - about 3.9 million (2020)
San Diego - One America Plaza (500 ft/150 meters) Los Angeles - Wilshire Grand Center (1,100 ft/335.3 meters)
San Diego - San Diego Padres (MLB), San Diego Seals (NLL), San Diego Legion (MLR), etc Los Angeles - LA Lakers (NBA), LA Dodgers (MLB), LA Chargers (NFL), etc
San Diego is a border city. It is located on the US-Mexico border. Mexican city Tijuana is located on the other side of the border.
San Diego - Cowles Mountain (1,593 ft/486 meters) Los Angeles - Mount Lukens (5,075 ft/1,547 meters)
Summers are dry and warm and winters are long and cold in both cities. LA receives more rain than San Diego in winters.
San Diego - San Diego County Los Angeles - Los Angeles County San Diego is the second largest city in California. Los Angeles is the largest.
San Diego - Balboa Park, San Diego Zoo, USS Midway Museum, Old Town San Diego State Historic Park, etc.
Los Angeles - Santa Monica Pier, Universal Studios Hollywood, Hollywood Sign , Hollywood walk of fame, etc.