Well, this is sort of an odd list.
The best low light scope in the group is P4Xi 4-16x56, but the magnification range is very different than the rest of them.
Brownells MPO might be the best rounded option of the bunch overall, but the 5-25x56 while very nice, is not quite as nice as the 3-18x50. If we were talking about the smaller versions, it would be the MPO 3-18x50 for 50mm scopes and PST Gen 2 3-15x44 for 42-44mm scopes.
I think Optika6 5-30x56 has the best reticle of the bunch (I know I am biased, but I designed this reticle because I like it), and it is very respectable optically.
Athlon ETR is very close to the Meopta in terms of image quality, but the reticle is thinner than I like. Both scopes track well and both benefit from a sunshade a fair bit. However, for my tastes, ETR reticle is too thin. I really prefer larger center dots.
With DMR, I has seen too much variability with DMR and DMR II. DMR Pro is better, but needs to be illuminated. Given the level of competition, I really insist on FFP scopes of this type having reticle illumination.
For me, depending on final use, the choice is between Optika 6, MPO and P4Xi.
ILya