(see me scratching my chin while furrowing my brow) You’re right. All have pros and cons. I have no experience with buying and having to move such a large piece of equipment. When we have bought something large it’s been a house, vehicle, etc. that we have already arranged payment for and we took possession the same day.
I guess if I had to pick only one choice, it would be the cashier’s check but you still have to arrange moving the equipment. So I am not sure that is best. Sorry I can’t be more help.