transcendence or reapers blossom would be my choice.
I enjoy transcendence
I would say grav or shatter as wins teams fights easily if you play it right and be patient. But both are easily countered at the same time.
Tho I'm a rhin luico main grav and nano are the best in my book by far
Mine is Lucio's beat as it is able to deny most ults and plus he is a fun character to play