So QV2 has definitely show to be stronger in effect and smoother to run while listening for me.
It is harder to stack so far with other QV2 and with Q . I am more consistently fatigued when using and/or stacking QV2 despite the format technically just being a different core and not a stronger build.
This could require adjustment, it could be the strength of DR QV2 stage 2 in particular. But I noticed something similar with RM and Emperor QV2 -fatigue sets on 6 or so hours after the loop.