Christian, not starting an arguement or anything mate, just in my experience (which i'm sure is less that yours, seen as you do this for a living) i've never had or heard of, until now, any problems with either make of cam.
My own experience, however, is that i have used both makes of cam and never had a single problem with either.
I always fit my own cams using Graphogen coated on the cam and followers with the cam lube pored over the top.
Start the engine and hold at 3000rpm for 20 mins then reduce to 1500rpm for 5 mins.
I've never had any problems with cams.
I believe they are a component that can suffer premature failure due to other faults, such as poor quality oil, incorrect grade oil, poor oil circulation, over heating, metal fatigue etc
Matt.