West Ham boss Sam Allardyce believes he is more "flexible" in his tactics than Everton counterpart Roberto Martinez.
The Hammers are enjoying a fine season compared to the struggling Toffees, with the sides set to meet in a third round FA Cup replay on Tuesday.
"I'm a little bit more flexible than Roberto - he is a total believer in one style," said Allardyce.
But Allardyce says Everton's problems this season are down to playing in the Europa League and more injuries.
Everton finished fifth last season in Martinez's first season in charge to qualify for European football, but are currently three points above the Premier League relegation zone.
West Ham are in seventh spot and 11 points better off than the Goodison Park side.
"You become flexible as time goes on," added Allardyce.
"Flexibility teaches you that you have a philosophy in the way you want to play, but if that way of playing doesn't suit the players you cannot keep that philosophy."
The FA Cup replay will take place at Upton Park after a 1-1 draw away at Everton and the winner will visit Bristol City or Doncaster Rovers in the next round.
Martinez has played down reports linking him with Cardiff keeper David Marshall and, despite speculation over the futures of Samuel Eto'o and Seamus Coleman, he is not envisaging any major departures.
"We are not entertaining that speculation of big sales," said the Spaniard.
"We are not going to sell our big assets in the window, so I think all those stories and admiration from the outside are just a waste of time."