on the Hot 100?

you will have to wait and see

Beyoncé obviously.

Britney if she promotes.
Beyoncé if she uses some tacky release tactic.
So it could be either way really.

Well comparing their latest lead singles Work Bitch/Pretty Girls vs XO I vote for Britney Spears.

Britney if it isn't a generic boring mess like Pretty Girls
Beyonce if it's entertaining and featuring a well known artist

Britney if she gives a damn which is unlikely.
Beyonce if she features a rapper plus a big feature like Adele

Beyonce. Britney's days of impressive sales/chart positions are over.

When was Bey's last solo top ten?

That "tacky" release you're speaking of was only related to the album. And that "tacky" release made her outsell Britney Jean (released 1 week earlier) in a matter of hours so... I'm pretty sure you wish your fave was this tacky

The singles had no surprise element. In fact, they were all available everywhere from the moment they were officially released.
Still, she got a TOP 2 Hot 100 single out of it

Seethe peacefully.

So we're gonna pretend Drunk In Love never happened. Ok boo. For your own sanity.

AS IF Jay Z is everyone's "go to" rapper for a hit. He add nothing to the song's chart performance.
Britney, on the other hand, went to Iggy expecting her to help the song smash and look what happened.

There were no rappers on 7/11 and it peaked higher than most Britney latest singles

Beyoncé since she actually scored a top ten song with her last era.

Bey is at her peak now, so her.

It's a pity 7/11 was a local hit which was irrelevant worldwide.

Beyoncé obviously.

And Pretty Girls was irrelevant everywhere...