Factors:

Measurements
Pad thickness
Pad weight
Tubing OD
Tubing Wall Thickness
Spring Diameter
Spring Count
Spring Length
Rows of stitches
Calendared mat fabric
Sun guard
User weight ratings
Number of Enclosure poles
Observations
Configuration options that effect performance
Accessories available for system

All of the measurements that we take are intended to help show differences between products and manufactures. This information is best viewed in a table that shows many different products at once. All of the measurements will display values that can be compared directly.  

We also make some observations relative to the feature element. We have observed that some manufactures offer accessories that can be used in conjunction with the trampoline. One of the most common accessories is the trampoline ladder.  Ladders can be a great addition to a backyard trampoline and can help insure a safe decent from the jumping surface back to earth.  There are a host of other accessories that protect and anchor your investment, but what is really exciting are some of the play accessories to keep your kids interested in making the most of your investment.  We have seen special basketball backboards that have been adapted to the trampoline, Bounce Boards, tents, balls and game kits.  

We created an additional category for products that can be reconfigured.  JumpSport and AlleyOop Sports offer a product called “PowerBounce”.  PowerBounce helps to dramatically change the mat softness or increase the efficiency.  They accomplish this with an additional spring hook, arm, and spring that run in parallel with the primary spring.  It is possible to make adjustments in one of three different positions, which gives users the ability to customize the feel of the trampoline according to their preference.