I'm relieved-- for a second i thought this was one of those Ginger/Mary Ann questions.
"It's just lines on paper, folks!"
I'm getting both, because I enjoy both the Gottfredson Mickey and Barks Ducks.
I found that as I read Walt Disney Comics, that the stuff I liked the most were Barks Ducks stories (especially the longer Scrooge and Donald adventure stories) and the Gottfredson Mikey adventure stories (which were originally daily or sunday comic strips).
emb021, these are the daily Mickey's (which are adventure strips). I believe the Sundays were typically gag strips and were not connected to the dailies.
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Here are some examples of reprints of adventurous Mickey Mouse Sundays by Gottfredson:
Gladstone Comic Album #3: The Liar of Wolf Baker: Mickey Mouse Sunday 1933.01.29 - 1933.06.18 http://www.comics.org/issue/44024/
Gladstone Comic Album #8 :Hoppy the Kangaroo: Mickey Mouse Sunday 1935.07.28 - 1935.11.24 http://www.comics.org/issue/44766/
Gladstone Comic Album #22: Sheriff of Nugget Gulch: Mickey Mouse Sunday 1937.05.16 - 1937.10.24 http://www.comics.org/issue/47413/
Walt Disney's Best Comics (Abbeville) #1: Mickey Mouse meets Robin Hood: Mickey Mouse Sunday 1936.04.26 - 1936.10.04 http://www.comics.org/issue/34724/
Out of the two, Donald is who I find to be more interesting as a character. The reason being is that Mickey is a boring "every-mouse" character and his mood is always predictably even. Donald, on the other hand is volatile and extremely emotional. He's also confrontational which is highly unusual for a classic Disney character.
When it comes to Mickey Mouse, I much prefer the Gottfredson adventurous character, rather then the "boring 'evermouse' character" we too often get. If the take is more akin to Gotfredson, I much prefer that.
When it comes to Donald Duck, I much prefer the Barks adventurous character (tho he can be emotional at times). I include the Barks-inspired work of Don Rosa as well.