While Ariana has sold out plenty of dates on her first arena tour, including but not limiting her two Madison SG dates (and likely another NY date since she will be coming back to NY to play barclay's center in september), and even managed to sell another bunch of dates over seas including (but not limiting) her two back-to-back Netherlands dates at the ziggo dome, and another Barcelona date - held at a 24,000 capacity venue on a Tuesday,

While S & D's sold out dates on their tours can be counted on fingers and neither of the two have grossed over 40M, who's tour out of Selena Demi and Ariana will gross the highest?

Ariana should with her list of hits and popularity. Demi is the better performer of the three. Selena is lucky to gross anything because her performance skills are not really strong. I'll say Ariana.

She may outgross them with the current tour, but her subsequent tours most definitely won't, as the quality of this one will certainly deter the audience from ever attending another Ariana tour date (this is based on crowd reactions, not my opinion.)

you may be right boo but who knows Ariana can be a whole new sIutty b**** her next era, and bring in a new audience? or maybe she'll go full on Urban and get another crowd.

She'll top Demi's last two tours combined and most likely Selena's as well. Selena will most likely do big bucks if she does that Zedd co-headlining tour that's been rumored, though.