I have tested both of these skis in their earlier generation. Cannot comment specifically on the current generation.
Although- from examining them, flexing them, and talking to skiers that have them (they are popular skis due to their excellent value -$$)- the current 110/125 appear to essentially be the same skis with a rockered tip. Rossi describes it as "moderate tip rocker".
http://www.rossignol.com/US/US/bc-125-- ... ml?b=41945
The BC110 has almost the exact dimensions of a Karhu XCD Guide/Madshus Annum. Like the Guide/Annum, the BC110 is single-cambered and has a smooth round flex pattern. I would describe the BC110 as being a little stiffer than the Guide/Annum. However- like the Guide/Annum I find the BC110 torsionally soft- it performs poorly on a dense base.
The BC125 is a fatter version of the BC110. I remember trying to hold the BC125 on edge- on consolidated snow, with T4s- it bent and twisted all over the place.
My opinion, based on limited experience- these are Nordic XCD skis designed for soft snow and moderate terrain. Very similar in intent to the Karhu/Madshus XCDs and the S-Bounds (I find the S-Bounds have a significantly stiffer flex pattern).
With my level of skill, I would be able to easily power either of these skis with a boot in the Excursion class (at this point in my life I would probably choke up the extra cash for the extra downhill power of the 3-pin hardwire on the BC125).
(If I wanted more power than the Excursion class- I would want something more powerful than either of these skis.)
Back to your original question- which one?
The 125 will offer more flotation and it will offer more traction underfoot.
The 110 will be faster in every dimension: edge to edge, and xcountry.
You and I are of the same height and weight. I too would want the long ones- for touring efficiency.
I already have Guides/Annums and love their flex in deep soft fresh snow.
If I ever buy another powder XCD ski, both the BC110 and the BC125 are serious contenders.
The addition of tip-rocker to the "Guide" should definitely improve downhill and climbing performance. Not sure how it will effect XC kick & glide.
I would actually prefer all of these powder XCD skis with a rockered tip and less sidecut...
But I am a weirdo.
