Jessie J hands down
I love Adele but let me see her belt an A5
Do the staccato Jessie uses in Who you are
or do her amazing adlibs/vocal runs
Jessie's voice is extremely agile Adele can not touch her.
Also emotions are subjective if you're going to come for me with Adele is more emotive
Jessie J clearly. Adele just knows how to make the most use out of her limited range by singing easier songs that are written for her range. She's only a 2 octave vocalist. Jessie J is 3 octaves, 2 notes. Jessie J is capable of much more potential than Adele will ever be.
Edit: Does singing pretty break-up ballads with the most repetitive chords count as better singing? Adele can emote but so can many others, including Jessie J with a much wider range and vocal advantage.
Edit: Hell even my fave is better than Adele vocally.
Jessie J ruins any talent she has by oversinging like there's no tomorrow.
She may have an amazing set of pipes and be technically more agile than Adele, but the fact she rarely sings without doing riffs every damn note makes her almost unbearable to listen to.
Adele on the other hand somehow manages to infuse so much power and tone with every note, and can write songs which put her voice to full use without sounding like she's trying too hard.
Jessie J ruins any talent she has by oversinging like there's no tomorrow.
She's not Christina Aguilera. I'm pretty sure Jessie J can hold herself back whenever she wants to, but she doesn't want to because she can produce clear belted vocals without strain while still emoting into what she's singing.