Under the 2017 tax reform, if you can buy your LC/LX for a business reason, the answer is definitely buy new.
Check with your CPA first, of course. As I understand it, you can claim the entire purchase price on your taxes (depreciation) which means your tax bracket is your discount.
If you pay 30% combined state and federal taxes, you get what amounts to a 30% discount off the purchase price. So let's say out the door with taxes etc it's $80k, your effective price would be $55k. On the used market, 55k gets you something 4 or 5 years old PLUS you pay income tax on the 55k you paid for the LC. At 30% income tax, you are really paying 70ish. So, if you buy new in the name of your business for net $55 and sell it after 5 years for $50k, it was almost free at 1k/year.
There is a draw back: you'd have to use it for 50% business purposes for 5 years. If you sold it within those 5 years, there would be some depreciation recapture.
Talk to your CPA to get the details.