Adele has flaw free tone, but Gaga has the better range and versatility and when she chooses, tone. I'll go with Gaga because she's my heart, but I also adore queen Adele.
So Gaga, but an extremely close second with Adele.
Adele has better vocals, but I like Gaga's voice better if that makes sense. What gaga can do with her voice, and how haunting and amazingly dark her vocals can mix and fit is fantastic
I think this is just based on personal preference. Both of them are amazing singers, technically supreme but I find if i had both on repeat, I'll get sick of Adele's vocals quicker?