It just seems like they are pretty much the same thing with a small diference. Wolverine got better claws and is more skilled.Sabretooth got the size and strength. And Wildchild got the Speed and agililty. Other than that they are pretty much the same and the only reason they realy don't get along should be there feral instinct to prove they are the alpha male.
Well, not quite. They all have different physical builds, durability, endurance, etc. Also, Sabretooth, compared to the other two, has the strongest healing factor because Wolverine has to constantly deal with that Adamantium poisoning. So, even their healing factors don't compare.