i think it depends on the primary weather
if its mostly cold, soup for sure. hot soup on a cold day is perfection. yeah yeah fuck gazpacho ok its rare to get a good cold soup
if you live in very hot or humid climates, a nice salad can be amazing. soup on a hot day is rarely gonna be enjoyable. sometimes if you are in the right mood, sure, but if you just come in from walking in 110 heat, which i have done many times, you don't want soup. you probably don't want much salad either (sushi is awesome!) but a great cold salad with tomatoes can be great.