Whether channels are worth watching is always going to be down to personal preference.
I’m old school and still enjoy TV broadcasts, and favour these over streaming. The 360 box will get there with time - bear in mind the system is still being developed and new apps will be added in time. There are always other factors at play such as licensing etc.
Sky may be a step ahead in terms of being first to add new features, but comparison-wise there’s not a huge difference in the channels being broadcast - Sky Atlantic would be the main difference. CNN will leave Sky eventually when their contract ends.
My favourite channels for content are Sky Witness and Sky Max (formerly Sky One).