The 600D has a rotating screen, can do 1080p and the quality will more than likely beat up any camcorder in the price rang[DOUBLEPOST=1400328612,1400328551][/DOUBLEPOST]
The 600D has a rotating screen, can do 1080p and the quality will more than likely beat up any camcorder in the price range. 60fps is useless since youtube is limited to 30fps. You can throw Magic Lantern on the 600D and bypass the recording limit completely. Having interchangeable lenses will always be a benefit. Even on YouTube you can notice the difference in a cheap DSLR vs a cheap camcorder.
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Still whatever way you look at it, DSLRs aren't good at recording video (at least for now), from the very nature of the design.
Focusing is a big issue, when recording the mirror is locked up and the camera is in Live View mode, therefore the fast, reliable and accurate phase-detection autofocus that you get when taking still photogaphy doesn't work. You end up limited to contrast based autofocus...which can be slow and not especially accurate.
Sure, you can use manual focus but still...then you have to stay the same distance from the sensor or you'll drop out of focus.
I mentioned the 60fps because even if Youtube is limited to 30, it won't necessarily always be and also if you are doing any slow motion or whatever then you have double the number of frames to play with. Slowing down 30fps isn't ideal.
Also Magic Lantern won't be for everyone, some people will be concerned about warranty, etc. Plus there is a theoretical risk of prolonged exposure to the DSLR sensor, it won't have been tested for greater than 30min exposures so as I've said there's a theoretical risk of damage due to sensor heat.
Camcorders primary function is video as opposed to stills photography and you're not really going to be worried about bokeh, dynamic sensor range etc. on a Youtube video so any arguments of the sort are a bit irrelevant.
Besides I'd recommended a camcorder based on the fact that I didn't know he had a DSLR already. What is more suitable for a particular person obviously depends on what they want it for too. Also I say this as someone with several DSLRs and lenses and stuff if that counts for anything!

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