I’d pick the mk4 out of what’s listed. Good optics. Steiner is good too, just heavy. My main complaint with the mk4 is the TMR reticle in FFP is kinda fat at 10x. I didn’t dislike it enough to prevent me from getting a mk5 with a FFP TMR reticle, but it’s worth noting. Honestly on a mk4, I wouldn’t be opposed with a SFP because the reticle is finer and the reality is 10x isn’t “too much” so you’ll likely turn the optic into a 3 OR 10x vs a 3-10