I read through this thread last night and had some thoughts...but trying to organize those thoughts cohesively was a challenge that I needed to sleep on. Ha!
The 2023 QST series has a lot more off-piste, soft-snow, bias than previous iterations...it's almost going back to the roots of the old Quest Series that the QST stemmed from. I was able to demo the 98 in soft, heavy, fresh snow. What a fun ski! I wrote a review on it, and it
can be found here. I got on the 92 for a single run, and I didn't feel like I gave the ski enough time to really get to know it on its own unique level...I kept comparing it to the 98, so didn't end up with a full review on it. I can confidently say that it mimicked a lot of the traits of the QST 98. The 92 felt oddly similar to the 98...but lacked a little bit of the stability that the 98 brought to the table. The 92 was a bit quicker edge to edge...but outside of that, I think I could ski a 92 on one foot and a 98 on the other and have a decent day. There are some skis that I could justify owning a 90-ish and a 100-ish ski from the same series; I would hesitate to do recommend that for the QST.
Some of the main differences that I felt between the 23 and previous iterations...
- More taper...it floats above its weight class (width class?). It floats like a one-oh-something but maintains the agility of a sub-100 ski.
- It skis a bit shorter, but I was still comfortable of the same length I've skied in the older versions.
- Nimble and easier to execute short turns. Which makes it a fun ski for bumps and trees.
You mention in your original post that you want something that you can bring west with only bringing one ski. The reason I would recommend the QST 92 is that you mention you want something nimbler than your current 99 to play in bumps and trees....the QST 92 checks this box (10 out of 10, would recommend). Buuuuut.....(there's always a but) my biggest hesitation on the QST 92 is it's soft-snow bias. It's fine on groomers if you're okay with some tip chatter that resonates throughout the ski, but it really shines in 3D snow. I think there are more versatile skis out there if you're essentially looking for a west coast one-ski quiver.
I got on the Sender 94 in the 172 but was unable to demo the Rallybird 92 as they only had the 162 at the time. Here's my
review of the Sender. If it's versatility you're looking for, one ski that does it all for your trips west, I think this could be your ticket. Hopefully
@Tricia can chime in on the main differences between the Sender and Rallybird, but given that the Sender has a strip of titanal, and the Rallybird a strip of carbon...the Rallybird should ride a bit lighter and softer, but the carbon will maintain rigidity in chopped up snow.
If you sell your current QST 99 to pick up a Rallybird or Sender for this season, you could always look for a good deal early next season on a 2023 QST 98. Personally, I think the Rossignol Exp 86, Rallybird 92 or Sender 94, and '23 QST 98 would be a pretty great 3-ski quiver.