you could probably do with reading pages 1 to 4 on the 9770 v's 8120(8010).
There is a formula however to working out which Combine was actually better, it is as follows:
count up all your spanners in your toolbox, multiply that by the number of dogs you have on your property, then subtract the amount of times you went to the corner store for bread and milk in a week, then divide that by how many cups of coffee you had while reading pages 1 to 4, hit the equals button on your calculator and there is your answer. Simple.
If still confused go buy a CR9070/9080 - best machine on the market.