What Ashtree said is technically accurate, not BS.
While the XY resolution of a mSLA printer is easy to define, as it is given by the actual resolution of the LCD panel, it’s the laser SLA XY resolution that is harder to define.
Anycubic Photon or any other mSLA printer with a 5.5" screen has a resolution of 2560 x 1440 has a print area that is120 x 68mm. That translates into 0.0468mm pixels (~47μm). Yes, being that this is a color LCD, each pixel is really a pixel group made of 3 subpixels, R, G and B, and there is a mask between pixels groups, but those would only be visible under a microscope.
Nevertheless, a 47μm resolution means the minimum feature size could be 47μm. You could draw a line that is a single pixel (47μm) wide and skip a pixel and draw another line next to it. So really the XY resolution in the mSLA is pretty cut and dry. The real issue is the resin properties. Is the resin being used capable of curing a 47μm feature without either bleeding into the next feature or overcuring the surrounding area?
On the other hand, a laser SLA like the Form printers has a relatively coarse laser spot at 140μm. So if you were trying to simply draw the finest line you could, it’s width would be 140μm. What complicates the equation on the laser technology (and gives the laser SLA an edge), is the accuracy of the galvos, the ability to position the laser spot with pinpoint accuracy. I don’t know how accurate the galvos on the Form printers are, as Formlabs doesn’t really give that information out, but assuming they can be within 30μm, you now have this situation:
You can only cure a path that is 140μm wide, but you can place another one 30μm next to it. So depending on the type of details you have, the positioning/orientation of the part and the resin being used you could resolve features that are much smaller than the 140μm diameter of the laser spot.
The the reality is that both technologies have their advantages, but to say that “laser spot has no relevance to resolution”, now that is simply uninformed.