Gaga, definitely. Poker Face, Bad Romance and to a lesser extent BTW, Paparazzi and Just Dance will definitely be remembered, whereas the only song by J Lo that I can see standing the test of time is Jenny From The Block and only because it's her moniker, so as long as she stays relevant as a celebrity, that song will also be relevant.
Gaga, definitely. Poker Face, Bad Romance and to a lesser extent BTW, Paparazzi and Just Dance will definitely be remembered, whereas the only song by J Lo that I can see standing the test of time is Jenny From The Block and only because it's her moniker, so as long as she stays relevant as a celebrity, that song will also be relevant.
Hot 100 is not all that there is in music. It's very inaccurate and unrepresentative.
Like I said in the other thread: J Lo has hits than Gaga, Taylor, Katy, Britney, Beyonce, Shakira, Janet, and pretty much any other pop girl apart from Madonna & Rihanna.