> "true" SLA

What is that? Why is it better?

Stereo lithography using lasers, vs "sla" now has nothing stereo about it nor lasers, just an lcd screen that exposes a 2d slice.

Why it's better is a little complicated and maybe not all one-way.

Definitely there are a lot of difficulties inherent in the way the lcd type has to move the part for every layer and fight a lot of suction every time, damaging a film that needs to stay optically perfect, frothing up the resin with bubbles yet another source of optical defects.

Maybe the laser machines have their own problems but not having to move the part (or move it much less and in a different less violent way) and not having to physically abuse an optical part has to make some difference.