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Slide mount docter vs. frame mount whatever (c-more/aimpoint/docter/micro/etc..)
A slide mounted docter seems easier (at first) to pick up for a sight picture since the optic is in about the same place as where your rear iron sight was. Bring your pistol up to sight...and there's the optic.
A frame mounted optic rides quite a bit higher. Until you get used to it...when you bring the pistol up to sight you've got to stop your arm movement lower/sooner that you would with iron sights. It's a bit weird at first to be "looking high over your gun"...because it doesn't feel natural/normal.
Both take some getting used to.
The Frame mounted optic stays "fixed" relative to your point of contact with the pistol (your hands)...so it doesn't "move around"...it's just there. Point your hands and the optic is still in the same relative position above them. So...easier to acquire the red dot.
The slide mounted optic moves back and forth (relative to your eye and hands) with every shot. Personally, I find it disconcerting to pick up the sight/dot for every shot.
Which is more accurate? From a technical standpoint...the slide mount is more accurate.
Between the inner barrel and the sights, there are a number of "lockup" points of contact. How consistently these points come to rest AFTER a shot determines how CONSISTENT a pistol is in grouping shots together (not considering gas and projectile variables).
1. Inner barre/chamber unit to outer barrel (doesn't exist for real steel)
2. Outer barrel to slide
With iron sights...they are "fixed" to the slide. Same to with a slide mounted optic (as long as the base to slide and sight to base lockup is tight).
With a frame mounted sight...there is an additional lockup point.
3. How consistently the slide (which holds the outer barrel, which holds the inner barrel) mates up with the frame and how consistently it comes to the same point of rest after each shot.
* note: Assuming base to frame and optic to base lockup tight and firm
Does it matter on a practical sense...not really, unless you're splitting pretty fine hairs. If you're AS pistol is so sloppy so as to introduce significant scattering of shots with a frame mounted optic...then it's likely that it's a scatter gun to begin with and a slide mounted optic won't help much anyways.
RDS are easier/faster to shoot with vs. iron sights. But one over the other won't make your pistol more consistent/accurate (you might be able to more easily aim accurately).
With AS go with whatever works for you.
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