Neither. It is like SilverSpot said, you need a top pull, bottom swing, with a 34.9mm clamp. It is best to avoid e-type ders when possible, and the top swing der you have pictured absolutely will not fit in any case (the CNC machined bb block is in the way). Spending $$ on a chi-chi front der is a total waste. There is really no functional difference between XTR and LX. Just a few (and I mean few) grams.
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