If you have cash in hand, why would you borrow/lease?
Outright ownership is far more flexible. You can get rid of the car after 3 years. Or you can keep it for 8 years. If you have a 5 year lease, you have to do a deal at the end of the lease if you wish to keep the car. If you have a 5 year lease and want to change the car earlier, then you will have to do a deal with the leasing company which usually involves taking out another 5 year lease on another new car.
If you buy the car, you can sell it to an employee without needing the involvement of the leasing company.
I suspect that you get a much better price being a cash buyer.
I don't think that there are any tax advantages to leasing, but I am not sure.
If you have borrowings in the company, then it would be a different matter. Would the effective lending rate on leasing be lower than on other borrowings? But, even then, I suspect that the flexibility outweighs any lower interest rate.