PolyLite™ Metallic Red PLA Pro 1.75mm

Printing Temperature: 190˚C – 220˚C
Bed Temperature: 30˚C – 60˚C
Printing Speed: 30mm/s – 70mm/s
Fan: ON

Direct Drive:
Retraction Distance: 1mm
Retraction Speed: 30mm/s
Indirect Drive:
Retraction Distance: 3mm
Retraction Speed: 60mm/s

Drying Settings: 55˚C for 6h
(Only if the material has absorbed moisture)

Short answer:
PolyLite™ PLA is a very rigid material with very low impact resistance.
PolyMax™ PLA is an extremely ductile material with high impact resistance and durability.
PolyLite™ PLA Pro is the best of both worlds combining excellent rigidity and high impact strength.

Long answer in the Polymaker live experiment here.

As you may know regular silk PLA has different mechanical properties as regular PLA, however with PLA Pro we developed a technology to have the silk and smooth finish without affecting the mechanical properties. PolyLite™ PLA Pro Silver has the same high impact strength and rigidity as the regular colors but with a much smoother and silkier surface finish.

Layer Adhesion (Tensile Strength Z axis):
PolyLite PLA Pro Regular Colors: 36.49Mpa
PolyLite PLA Pro Metallic Gold/Silver/Bronze (Crystal Powder): 30.12Mpa
PolyLite PLA Pro Metallic Blue/Red/Magenta (Pearl Powder): 34.32Mpa

For your reference:
PolyLite PLA Regular Colors: 40.55Mpa
PolyLite PLA Silk Colors: 20.21Mpa
PolyLite PLA Carbon Fiber: 15.13Mpa
PolyTerra PLA Regular Colors: 12.20Mpa
PolyTerra PLA+ Regular Colors: 16.69Mpa

Silk PLA are very weak because of the formula change, the PLA Pro metallic is not a formula change but a color master batch optimization, the effect on the layer adhesion is minimum.

You lose 50% strength when going from regular PLA to Silk PLA.
You lose 6%-17% (depending on the color master batch changes) from PLA Pro to PLA Pro Metallic.