I tend toward aspen of the two it is common and fast growing tree and the chipped product is from branches and such as the lumber is used in construction and panels (often a by product). Cyprus is a slow growing, long living tree. Cutting a old tree down to grind it to mulch and needing to many many years to replace it is not a good environmentally responsible option. Especially given they tend to grow in wet lands this often has a large impact on native herps.
I would suggest also coco coir, aka eco earth. It is available from greenhouses as peat moss replacement. It is super cheap (31 cubic feet uncompressed for 18$ roughly the same as 10 large bags of aspen chips (native earth 2.2 cubic foot large bags @ 8$ a bag... $18 to $80)
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