I would say the Tauranga Aero Club is a better bet if you're interested in learning at Tauranga. It may also be worth giving BayFlight a try. Air Discovery is okay for Rotorua and Whakatane, though I don't thing they do anything at TRG despite being based there.
There are lots of training outfits based at Tauranga, so you've got lots of choice there.