The Rossolimo is the Anti-Sicilian that is by far the most popular with club players - and with elite grandmasters such as Magnus Carlsen, Anish Giri, and Alireza Firouzja.
If you play 3.Bb5 in the Sicilian, you do not need to keep up-to-date with the dazzling theoretical developments in all kinds of Open Sicilians. You can sidestep theory, play your own creative game - and put your opponent in trouble! You will love the harmonious, easy development and reach unbalanced positions with winning opportunities and surprisingly dynamic play.