Thanks for getting back to us so quickly!
Unfortunately the price you mention was due to a technical glitch, and it has since been corrected.
In response to your technical question, in practice the performance of the docks (outside of the charging element) should be identical.
For your reference, the physical factors (outside of the price difference) that would differentiate the two would be:
A. TBT3-UDV has five USB 3.0 ports. TBT3-UD1-83 has two.
B. TBT3-UD1-83 has one USB 3.0 Type-C port. TBT3-UDV has none.
C. TBT3-UDV has a single combination audio jack. TBT3-UD1-83 has separate audio input and audio output jacks.
D. TBT3-UDV includes an ‘Active’ DisplayPort to HDMI adapter, which supports up 4K resolution @ 60Hz refresh rate. TBT3-UD1-83 includes a ‘Passive’ DisplayPort to HDMI adapter, which supports up to 4K resolution at a 30Hz refresh rate
E. The TBT3-UDV provides up to 60W of power to the host system. The TBT3-UD1-83 does not charge the host system.
F. TBT3-UDV can be placed horizontally or vertically. The TBT3-UD1-83 can only be placed horizontally.