From the evidence of the Phoenix meeting it would seem that the Audi is superior on Ninco track where the voltage is high, around 20v. I think it is the Phoenix meeting Driver 3 is referring to, its a long time since hes been to Pendle. On our 8 lane 130ft Ninco track at Eastcote there is little between the Audis, Toyotas and evo Porsches, running on around 15-16v.
On routed track I believe a well set up Toyota can still win. At the recent Molesey open day the home drivers were lapping in around 9.5 s with both Toyotas and Audis. I think more depends on set up and driver skill than type of car.