OK, this is slightly unhelpful as my comparison is QR and 20mm Revelations, not Foxes. But, it's a pretty good comparison. I used to have QR 130mm revelations on my Soul, which were briefly replaced with Maxle 140mm revelations. Same wheel, frame, etc, in fact the only components that changed were the fork, and the adaptors in the wheel.
Yep, the maxle one was stiffer. The difference is there if you think about it… But once on the trail, I just didn't think about it, both forks got on with the job fine. People said "Oh, you'll never go back to QR"- after a couple of months, I did, and it's absolutely fine. The difference just isn't big enough to get worked up about, and in the final analysis I don't think it make any actual difference to my riding.
The big bike has a maxle in it, since the newer revelations don't carry much weight penalty for it there didn't seem much reason not to, but I'd be happy enough with QR in that I'm sure.