Lauren is a "different" signer than Pia or Hailey. It's not really about better. It's what kind of style appeals to a larger audience.
Scotty and Lauren have a larger fan base because Country music appeals across a much broader audience. Everyone thought Hailey would survive because the country vote would split. But obviously that didn't happen.
And for those thinking that it's only little girls voting, what is the excuse for Lauren making it over Hailey?
honestly, Scotty and Lauren will have longer and more financially successful careers than anyone else on this years show simply due to two things.
1. They both sing really well.
2. Country music has a much more loyal fan base than most every other genre.