You need to estimate how much that deductible would cost. So you need to estimate the likely claims in a year. You don't provide a time frame for your data, so you don't provide enough information for the calculation (which is OK -- it's really your calculation anyway). For claims under $10000 you need an estimate of the total amount of such claims. For claims over $10000 you need an estimate of how many (each such claim will cost you $10000 no matter what the actual amount is).
ONce you know the likely cost of the deductible, you can determine if it is more or less than the offered saving.