There are 4 flavors to choose from when it comes to anti-aliasing. Here is the run-down:

• Off:
  (+) The cleanest, most crisp image. Texture clarity/sharpness and color are 100% correct. Fastest performance!
  (-) The most jagged, "noisy" image.
  
  
• FXAA: [Fast approximate anti-aliasing]
  (+) The highest performance AA method.
  (-) The most blurry image.
  
  
• SMAA: [Enhanced subpixel morphological anti-aliasing]
  (+) The sharpest AA image, with the most accurate texture color of the 3 methods.
  (-) Not as jag-free as TAA. Not as fast as FXAA.
  
  
• TAA: [Temporal anti-aliasing]
  (+) The strongest anti-aliasing method, with the least jagged image both while moving and/or still.
  (-) Not as clean of image as SMAA. Slight, but noticeable "ghosting"/motion blur. "X-ray" artifacting. Causes noticeable texture lightening, color oversaturation, and shadow blowout. The most intensive anti-aliasing method.

*Of course, you could probably over-ride these with any AA options available through nVidia/AMD software.

Motion Test 1:
https://youtu.be/v6EEsu3f5_w
Motion Test 2:
https://youtu.be/1S8Oz_mvAno
Stationary Test 1:
https://youtu.be/EtYb-ZcB_eg

We also have several flafors of AO to select from. Here do be the run-down:

• Off:
  (+) Fastest performance and brightest image.
  (-) No added visual benefit from realtime, filter-based AO shadows.
  
  
• HBAO Low / Medium / High: [horizon based ambient occlusion]
  (+) Slight surface shading definition enhancements, by apparent highlighting of upper surfaces.
  (-) Entirely minimal and useless effect, from its implementation in-game.
  
  
• SSAO Low / High: [screenspace ambient occlusion]
  (+) Adds relatively convincing shadows, with relatively decent performance.
  (-) The shadows are not very accurate, being merely a screenspace filter, and adds a noticeable performance hit. "Flashlight" artifacting. Blatantly obvious, Inaccurate shadows will occur.

AO Stationary Test 1:
https://youtu.be/ux6XDthkG-o

It adds some special effects that actually look cool, but mostly it makes everything super dark and ugly. I'm not a fan. It's too bad we can't customize which effects we can use, in order to add HDR or bloom but not shadow inundation, for example.

Post Processing = OFF

So, what settings would I recommend?

• AA - SMAA (best texture color & sharpness), TAA (most jag-free geometry)
  
• AO - Off / SSAO Low
  
• Post Processing - OFF

What would I not recommend?

• AA - Off / FXAA
  
• AO - HBAO / SSAO H
  
• Post Processing - ON

Here are known artifacts that occur with certain settings:

• TAA + any settings - Causes slight, but noticeable "ghosting"/motion blur effect when moving. Also causes "X-Ray" effect, allowing dinosaurs to be visually detected/traced when behind objects.
  https://youtu.be/wkSHJ3gjoYA
  https://youtu.be/7IP7AIQU6HM
  
• SSAO Low + any settings - Causes "foliage X-Ray" effect.
  https://youtu.be/HYYD9wCtBPw
  
• SMAA + AO=Off - Causes white flickering on ground, occasionally.
  https://youtu.be/DoKGmhOy1MQ
  
• TAA + SSAO H + Ultra + Render Dist 1 + Shadow Dist 1 + PP=Off - Causes white flickering, occasionally.
  https://youtu.be/2vlKPGElWoQ
  https://youtu.be/RyBdu34uwc4
  
• SSAO H - Very bizarre tree foliage flickering/shading errors when moving.
  https://youtu.be/U4j-4qZQEb8

*As of version 0.92.03.