"This was a significant turnaround on 2013, and a timely reminder of the value of a diversified portfolio."
The NZX-run Smartshares scheme was the best performer in the conservative and balanced categories.
While the Fisher Funds TWO scheme was top in Morningstar's aggressive growth category.
Mercer and Milford headed up the league tables in the growth and moderate categories respectively.
But Douglas said long-term performance was more important.
Over three and five years Aon KiwiSaver Russell and Mercer KiwiSaver have been the top-performing fund managers across the board.
Fisher Fund's Growth Fund has been the top performer in the aggressive category over five years and Milford has been the top performer in the balanced category since inception in 2010.
Despite this the biggest players remain the banks.
ASB and ANZ-owned OnePath have combined 46.6 per cent of KiwiSaver assets between them.