IMO Bentley is a better all-round 'keeper than Royce ever was. Bentley commands his area more, and has a much greater presence. Not only that, but Bentley's distribution is light years ahead of Royce's, which these days is far more important than it was in Royce's day.
The only area where I would say Royce is better is his actual shot stopping. In that area Royce was superb.
Royce took us to flirting with the play offs in the second tier. Bentley looked good in the fourth tier.
The only thing Bentley has over Royce today, IMO, is distribution. Royce wasn't as tall but was ok at commanding his area, especially considering some of the numpties he had playing at centre half.