As of now, Naruto and Sasuke haven't died in the Boruto manga. Their characters continue to play significant roles and contribute to the story's development.
The Naruto manga continues well beyond Sasuke's departure. It covers many significant events and character arcs that shape the overall conclusion of the series. Sasuke's leaving is just one part of the larger narrative.
Sasuke and Naruto were both very powerful characters in Naruto, but it was difficult to determine who was more powerful in the manga. Because their abilities and backgrounds were very strong, they had made great achievements in different fields.
Sasuke was a genius ninja of the Uchiha clan. He had unparalleled speed and strength, as well as powerful eye techniques. He often used various powerful ninjutsu and skills in battle, such as Unlimited Moon Reading, Susanoku, and so on. He had defeated many powerful enemies in battle, including Naruto's father and Naruto himself.
Naruto was the genius ninja of the Uzumaki clan. He had a strong vitality and powerful ninjutsu ability. His commonly used ninjutsu included the Spiral Pill, Shadow Clone Technique, Tail Beast Jade, and so on. He often used various techniques and strategies to defeat his enemies in battle. He had fought fiercely with Sasuke in many battles and almost defeated Sasuke at one point.
In the manga's plot, Sasuke and Naruto both showed very strong abilities and strength, so it was difficult to determine who was stronger. Each of them had great potential and strength in different fields, so if they fought, it might be very intense and exciting.
Sasuke often appears in different story arcs of the Boruto manga, depending on the current plot and mission. Sometimes he's on a solo mission, sometimes he's involved in events related to the village.