Erm, fact is they're both high end guitar manufacturers. They both have their own players. Take for example Martin, John Mayer almost exclusively uses Martin for his acoustics, so much so that Martin even made a limited edition guitar in his name.
I can go on and on about which artist uses what but there's no point.
Elixir strings are great, but I find that their coating muddles up the tone on certain guitars.
My Martin loves uncoated strings 

True that, I think intonation/action can send for settings. Unlinke electric, where we can do it ourselves. Neck feel? Of course It is important but didn't mention means its ok lor.

Btw, who carries seagull yeah? I shall give it a try.