Unless rates are outrageous, it makes very little difference what actual rate you pay for your equipment. Take someone financing a trencher for $75,000.
If you bought new equipment from a dealer and were approved at a 5% rate over 5 years, your payment would be about $1,400 a month (depending on total of dealer fees). If you didn't use dealer financing, but did used a third party leasing/finance company (with good credit) your payment might be $1,600 a month or so, a difference of $200 a month.
Here's the deal - unless the amount of money you plan to make monthly from having that trencher is significantly more than $1,400 (or $1,600), you shouldn't be buying the trencher anyway. Most of the time, when we talk to people about buying a $75,000 piece of equipment, the income they would miss out on by not having that machine amounts to $10,000 a month or more. The $200 difference in payments is peanuts compared to the costs associated with not getting your equipment.
Additionally, the benefits associated with certain types of contracts (tax-wise, bonding-wise, etc.) could eliminate the difference all together!