THE BIGGEST AND THE BEST
The biggest star is the UY scuti reaching 1700 times bigger radius than the Sun and being 30 times heavier
r136a1 is 30 times bigger than the Sun but 315 times heavier
Lets go bigger with quasi stars
quasi stars are stars that have a black hole in the centre
And yet even UY Scuti is small and childlike in comparison to quasi-stars.