Another consideration is what you are making. If you are making a long whip that will use two hides, you will need to find two hides of similar thickness. The thickness of the hide wil make a difference in how the whip looks. A thicker hide can give your whip a more rugged look and a thinner can give you whip a smoother look (how you pare the strands will also change the look of the whip).
Scaring and stretchiness of the hide are also a factor in selecting the kangaroo hide. A hide is virtually useless if it’s overly scarred.
Right now I’m looking at two natural tan kangaroo hides and I’m trying to figure out what to do with them. One hide is 52dm and the other is 53dm. I could make one 10-12 foot bullwhip or make a two 6 foot bullwhips. Making a pair of 6 foot bullwhips appeals to me right now…but before I can use those hides I’ve got an 8 foot budget bullwhip cut out and I think I’m going to plait that before I cut up more roo hide.