Now I'm more curious what others think, as I may find out for myself in a couple of weeks. But in my understanding these two were supposed to be roughly the same thing as they are both NAS, and it came to my belief that the McClellands line comes from the distilleries that own the same people as Bowmore (perhaps owned by Bowmore themselves).
As a price point
Bowmore Legend ~$16
McClelland's Islay ~$23
The prices I also found odd, as I thought the name Bowmore would earn more respect than McClelland's which is a new label selling whisky from different distilleries under the same name, but isn't really an independant botteler.