I tried youtubeTV this summer and hated it. With a passion. Hated not being able to flip between channels. Hated the interface. Hated it.
That said, you don't have to get the full YouTubeTV experience to get SUnday ticket. You can get Sunday Ticket as a stand alone. Which, I did. Fingers crossed they know their shit and the streaming is seamless. I was a DirecTV sunday ticket subscriber for 25 years and I am pretty sure this is gonna be a worse experience.