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Honestly, my general opinion is that too much hype is read into interleague records.
The sample size in any given year is so tiny that wildly strange swings are common.  So, you have to add up totals across a decade to get a meaningful pool for any individual team ... but then again, teams don't play ALL teams.  Seattle gets to pick on San Diego, (I'm thinking KC probably enjoys facing St. Louis regularly a lot less).
And, if you're talking about a team's performance over a DECADE ... well, you can draw just about any conclusion you want.
Overall, I have a hunch the DH gives the AL a VERY minor roster edge -- (but that would apply to all teams -- (though Seattle was probably lucky to NOT have to use their DH against NL teams in 2010)).  My rationale is actually that more of NL *PITCHERS* dislike having to sit instead of hit -- while AL pitchers enjoy TRYING to hit ... which creates a minor improvement in AL pitching over time relative to standard performance.  But, of course that's all speculative and theorhetical.
I mean ... look at Seattle versus division rivals from year to year.  There are years where Seattle has DESTROYED another club ... where on paper, it just didn't make any sense.  Then, have the exact opposite results the following year.  Seattle went 9-9 in 2010 (but were outscored 59-65). 
They got utterly crushed by LAA (4-15; 62-100) and Oakland (6-13; 54-84)
They went 4-6 against both the Twinkies and the Yankees, outscored only 25-29 and 35-45.
Go figure.