I pretty much suck uniformly, though sometimes I have “good days” where I’m shooting really well (at least, for me) consistently.
The biggest hardware differences I’ve found relate to size, trigger type, and sights (absent weird issues like my thumb riding a slide release). I’ve shot a few pistols where the grip is small enough that I don’t get proper trigger position and I start doing weird things with my grip—e.g. P3AT, LC9s, or M&P 22 compact. These I tend to pull left.
I mostly shoot Glocks and can do OK with that trigger, but on a long DA revolver or something like my dad’s USP40 compact (it’s sort of DA, maybe the LEM trigger? I”m not sure) it gets me all kinds of messed up and shoot way low.
With sights, the configuration of irons doesn’t make a difference to me. What does, is using an MRDS. My accuracy beyond 5 or so yards improves (and improves dramatically beyond 7 yards), and I can actually track the sight between shots instead of just shooting and waiting for them to reappear in my field of vision like I do on irons. For equal time, I’m more accurate; for equal accuracy, I have better range and/or I’m faster. Pretty much on every measure I improve with an MRDS. I suspect at least part of it is vision issues.
But overall, I still suck compared to the rest of you.