OMFG can the Britney vs Gaga thing just die a painful death already
Aren't they like friends or something? Weren't they talking of collaborating in 2013? Wasn't Telephone originally a Britney song?
While Britney doesn't have Gaga's vocal chops, you don't need to have those to be an iconic dancer, performer, and have great aesthetics and music and just be a goddess in general
Even choosing between Bad Romance and Toxic for which is more iconic is pointlessly splitting hairs (although personally I think BR has a slight advantage)