Here are some more details to help you decide:
Speed: Glowforge Aura uses a blue, 6 watt, solid state laser for powerful cut speeds. Compared to Glowforge Plus’s 40 watt CO2 laser, Glowforge Pro uses a 45 watt CO2 laser which lets it cut at speeds up to 12X faster than Glowforge Aura.
Warranty: The Glowforge Plus and Glowforge Pro both come with a full 12-month warranty.
Material Size: The Glowforge Aura works with materials 12 in x 12 in size. The Glowforge Plus and Glowforge Pro work with materials up to 18 in deep, 20.4 in wide, and 2 in tall. (The maximum printable area is about 11 in x 19.5 in.)
With the Passthrough slot, the Glowforge Pro lets you make enormous oversized prints. It can work with materials 20 in wide, up to ¼ in thick, and as long as you want. To use the passthrough, you print the first 10 inches, slide the material through the slot, and repeat. That means you can create huge, dramatic products, including furniture!
Laser Class: The Glowforge Plus is a Class 1 laser (like a DVD player). The Passthrough slot makes the Pro model a Class 4 laser which requires the person using it to have laser safety training (included with your purchase). You should not use the Pro in public or around kids without installing the included Pro Shields.
Operating Temperatures: The Pro is designed for printing all day in temperatures up to 81°F (27°C). The Basic and Plus will pause periodically to cool if used continually in warm temperatures; they’re designed for environments up to 75°F (24°C).
Technology: The Glowforge Plus has an upgraded linear system to support faster motor speeds. The Glowforge Pro adds a solid state cooling unit and an upgraded 45 watt laser for the fastest possible prints. Aura
