I can't think of a team in the last 10 years who had 2 equally good goalies scrapping it out for playing time...
I can only think of one team ever having two really good goalkeepers fighting it out for playing time,
Cech and Cudicini at Chelsea.....but even then it was never really a scrap, Cech was the undisputed number one when he was fit and well.
If a club is chopping and changing their goalkeeping position on a regular basis it suggests neither is particularly good.
And as others have said, no top class goalkeeper should be happy sitting on the bench week after week, Cudicini notwithstanding.