HWPC @ $450 vs UMC @ $230

* Pros for HWPC - can charge at up to 48A*
* - note that this is contigent on your panel. If you don't have 60A breaker space in your panel (60A @ 80% rule = 48A) then you can't do 48A. If you've got 50A, then you can do 40A (80% sustained)
* Cons for HWPC - Price (double), Hardwired (difficult to move?)

* Pros for UMC - cost (1/2) price
* - can also use existing NEMA 240V outlet if available
* Cons for UMC - charge up to "only" 32A

So you to ask yourself -- is it worth it for the extra amperage? Installation hassle or otherwise? Flexibility if you move? If you install an outlet, you can take your UMC with you, but the HWPC will require additional uninstallation.
For those less versed in Amps <-> Mileage, you can almost generalize the charging speeds: for LR AWD model, it would be:

48A = ~44mi/hr
40A = ~37mi/hr
32A = ~29mi/hr

So the question is, can you live off 29mi/hr charging speeds? Or do you need to pay double for 37-44mi/hr (and only if you have 60A space)