Which Test is Best?

I have a question for any of you who’ve had experience using multiple testing services.

I’ve been tested by 23andMe, Ancestry, and MyHeritage. All of them offer slightly different results. For instance 23andMe says I’m mostly British Isles and German, while Ancestry has me with some Dutch and Danish, Ancestry says I’m mostly British isles and German but I have 1% Aegean Islands.

Which of the three is likely to be more correct?