This is EXTREMELY dependent on the person and the shaft setup they have with those particular clubs.
At one point a few months ago my G25 and Anser were carrying approximately the same distance. At the range Id launch both of them, and they would both take one hop and hit the fence before landing again (carrying somewhere just under 250).
However, considering total distance:
The Anser has a MUCH shallower angle of descent as the ball flight is low, plateaus early and forever, then gently glides down to the ground, then rolls 30-40 yards (Im so not kidding). On a dry day at a red clay golf course Ive hit 280 yard drives with that thing, and my swing speed tops out around 105mph.
The G25 launches at a higher angle plateaus later and for a shorter distance, then lands much steeper (more vertical angle of descent). Id guess 10-15 yards of roll after carry, maybe. I kind of wanted it to stick where I put it more or less - I started to drive right through dog legs and thats problematic.
The i25 sits right in-between these two distance-wise but I gain so much more control and workability, and I dont sacrifice distance on fade/draw. When I first hit the demo club (same setup I bought), my club fitter (Golf Digest fitter of the year for Ping) said, "thats freaking perfect" - words I haven't ever heard from him. And they are the kind of fitters that keep me from buying stuff I dont need - they'll tell me "you dont need that, we just need to straighten your swing/foot position/etc. The ball flight started out low, creeped higher, plateaued without ballooning, and landed a little less than 45 degrees for an authoritative roll forward. It was the no-kidding perfect ball flight.
So Ill probably get 20-30 yards of roll after carry with that driver, but keep in mind, more times than not Ive seen Anser-like ball flight characteristics rather than G25-like ball flight from this club. It could simply be the cold thin air right now, but that is all I can attest to right now.
Shorter anser (pun intended): i25 is probably about 20 yards longer than my G25, but Ive set it up to be like that. Its also only about 40 degrees around here - things could be much different when the temp is >70 deg.