Telephone. And there's no contest.

Only on ATRL and amongst stans is this 'iconic'. People who aren't invested in pop culture don't even know that such feud exists - well not in the U.K. anyway.

Teléfono was massive.. both song + video.

Certifications in the 10 major markets:

(Telephone/Bad Blood)

U.S.: 3.38m / 2.4m
UK: 700k / 200k
Japan: 200k / 15k
France: 150k / 15k
Germany: 150k / 65k
Canada: 240k / 180k
Australia: 210k / 140k
South Korea: ? / ?
Brazil: ? / 4k
Italy: 30k / ?

Telephone was bigger everywhere.

Telephone everywhere.

Well, it looks like we have a clear answer.
Unless, of course, they want to bring up VEVO views, to which they reserve the right.

I don't wanna think anymore
I left my head and my heart on the dancefloor

Telephone in every way.
Lady and Knowles have more impact and star power together than the girls in Bad Blood combined, which is why it was a monumental success - worldwide and in the U.S. Lady brought back longer music videos, and soon after it became the norm for music videos to be lengthy. For Telephone to rack to rack up 200 million views, in an era when music streaming wasn't as prominent, is a success in itself.

Considering Telephone sold 7.4M in 2010 alone (OP's bias is ) and only didn't snatch every VMA because of Bad Romance's unstoppability, it wins. It's over 9M today.

The VOTY award doesn't lie. The VMAs and MTV agree. Bad Blood is bigger. Sorry telephone

Telephone

I used this source.

Telephone was bigger.

IFPI shows 7.4M sales in 2010 alone. Or do they only count for Katy Perry's album shipments?

OT: Telephone.

Telephone by a landslide

Telephone, which is nearly 10M WW.

I was never here for Bad Blood and even tho it had a nice video and was a nice lil event, there are so much better songs deserving single treatement on 1989 like OOTW, Stay, Clean, Wonderland, I know places

Telephone