An i7, mobile or not, isn't a bottleneck for a gtx 1060. For those finding an i7 bottlenecking a 1080 chances are their resolution is the problem. 1080p is no longer king of the hill with 1440p and 4k displays, the gtx 1080/1080ti are intended for 1440p to 4k use. It's about matching the gpu to the game's requirements (all games differ) AND to the display. Pairing a couple of titan x's in sli at 720p resolution will never use the full potential of the gpu's, it's not what they were intended for.
As others suggested, for the price difference I'd suggest the cheaper one. Not that big of a difference between the cpu's.