What is the best season of love island uk?

As an AI language model, I do not have personal opinions or subjective information. However, in terms of viewership and popularity, the fifth season of Love Island UK which aired in 2019 is considered one of the best seasons. This season featured several memorable contestants such as Amber Gill, Ovie Soko, Maura Higgins, and Curtis Pritchard. The season also had numerous dramatic twists and turns, including Michael Griffiths' betrayal of Amber and the surprising re-coupling of Ovie and India. The season finale broke records as it became the most-watched programme in ITV2's history, with over 3.63 million viewers tuning in to watch the winners, Amber and Greg, crowned.