This from GOT homepage has put me off a little..
"However, the club’s defensive record has been average during Emery’s tenure as they have conceded over 50 goals twice in his three years at the club. Although it hasn’t affected Los Rojiblancos’ position in the league, it’s an area Everton have to improve.
As a result, Emery may not be the man needed to remedy the Toffees’ issues, whereas De Boer has enjoyed excellent results during his tenure in Eredivisie, improving Ajax’s defensive record every season he was at the club.
De Boer guided the Amsterdam-based outfit to four league titles in six seasons, narrowly missing out on a fifth success on the final day of the last campaign as PSV Eindhoven snatched the crown.
The Dutchman’s experience as a world-class defender would benefit the development of Jon Stones, and solidify the Toffees at the back following their struggles at the end of the term".