Hi there and thank you for your question!
There are no vegetables and fruits that are 'best' on their own. I believe it is best to eat a colorful variety of fruit and vegetables. Fruits and vegetables come in many colors – red, orange, yellow, green, blue, purple and white - and each color provides different vitamins, minerals and other nutrient that are important for our health. For example, some yellow and green fruits like lemons and kiwis are a good source of vitamin C, which plays an important role in our immune system (1). Some orange vegetables like sweet potatoes and carrots are a good source of vitamin A, which supports healthy vision (2).
Hope this helps!
Anna Ng, RD
1. "Vitamin C" National Institute of Health. Updated February 27, 2020. Retrieved from https://ods.od.nih.gov/factsheets/VitaminC-HealthProfessional/
2. "Vitamin A" National Institute of Health. Updated February 14, 2020. Retrieved from https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/