jag, you should be looking at the charge/discharge numbers, average voltage, runtime, internal resistance, voltage cutoff and runout.
Most matchers charge the cells at 5 or 6 amps and discharge at 30. Watch for those who discharge at 20 amps instead, it will inflate the numbers. Also watch out for those who play with the voltage cutoff, the standard is 0.9. Some will stop the voltage averaging early to inflate the numbers. The standard for runout is 5000.
The higher the average voltage, the more top speed you will have, the lower the internal resistance, the more punch you will have. Runtime is runtime... Make sure whatever cells you go with have all these numbers printed on the label. We print charge/discharge amperage, average voltage, runtime, cut off voltage, runout, average internal AND relative internal resistance as well as mahr on our cells. Hope this helps...