Cash?
If your business can afford it, you might decide to purchase the equipment outright. That's fine, but it may deplete the financial resources that you could be investing back into your business in more productive ways.

Bank Loan?
Again, a reasonable decision, but not necessarily a practical one. Although it preserves capital, a bank loan may impact your available credit. And, it will probably dip into your cash reserve, because most banks do not offer 100% financing

Leasing
This may be the best alternative, because it offers the following advantages:

Leasing may lower the total cost of the equipment.
Tax advantages often make leasing less expensive than an outright purchase or bank financing.

Leasing improves cash flow.
Leasing allows you to pay for the equipment as you use it, to generate income for your business.

Leasing preserves available credit lines.
You get the equipment you need now, without tying up valuable credit lines. Your borrowing capacity is available for your operating needs.

Leasing provides fixed payments.
Your monthly lease payments don't change; variable bank rate loans frequently do.

Leasing offers 100% financing.
Most bank loans require a substantial deposit or down payment.

Leasing conserves capital.
Most businesses prefer to use their valuable capital as an investment in other aspects of their operation.

Leasing keeps your business current.
Your don't have to worry about technology obsolescence when you LEASE the equipment that you're depending on in order to grow your business.