Official attendance was 9,034.
Compare that to the largest published attendance at Titanium Security Arena which was 8,127 for Game 2 of the 2014 GF Series against Perth. I say published attendance because there are some who believe the crowd for Brett Maher's last regular season home game there in 2009 was over the 8,200 mark.
A crowd of 9,000+ wouldn't have been possible at TSA, not without breaking a few laws since its only licensed to hold 8,000 for any event (including concerts).
So far, at least as far as attendances go, it would seem that the 36ers made the right call in moving to the Entertainment Centre, even if it is actually an older building (TSA opened in 1992, the Ent Cent opened in 1991. Ironically both opened as a replacement for Apollo).