Consider the 3rd option: Tesla "inventory" cars. You get the full tax credit, new vehicle financing & lease rates... and a decent or sometimes very significant discount (typically end of month, quarter or when new model released).
We bought our 2015 P85D as an "inventory" car from our local Tesla showroom in the mall and saved 10% vs. buying new... and it was only 4 months old and only had 2,900 miles on it. This entitled us to 1.43% interest on our 60-month loan, $7,500 federal tax credit, $2,500 state EV rebate, $400 SoCal Edison EV rebate... and a Ludicrous upgrade (now a P85D) for $5,000 just like a "new" Tesla would.
The 10% discount basically meant we bought a P85D for almost the same price as a non-Performance 85D which would have delivered FAR fewer "smiles per mile".
Inventory stock as in Tesla's demo/showroom stock?
Did you have to ask or was it listed on the US website?