I think there is enough place in the industry for both girls.

Christina has musch powerful voice than Gaga, and Gaga is much more shcoking now than Christina.

Both of them does great music.
Not even Gaga invented electroni or pop music.

Christina said in 2006 (Gaga was nowhere that time) that she would make a FUTURISTIC - ELECTRO SOUND album.

So shut up and don't comparise them.
If you love good music, love both!