I work in Scandinavia.
When I worked APP, most of the time I ALWAYS let the "North european" carriers go first; but that was solely because I knew how the operated and what to expect...
Tossing out "Left by 10, and keep speed 280 or greater" to a charter-carrier could give any kind of result just due to the "language barrier" and that they were (are?) used to different ways of doing things... So to keep things simple and avoid unpleasant experiences they came last in the queue, and where a misunderstanding wouldn't yield too much of an inconvenience.
Maybe its transferable to "Spain today?". National carriers and ATC "speak the same language" and know what to expect from each other?