Keeping in mind we are talking about backing up data, not backing up game cd's.....or dvd's.......I'd say flip a coin. Both function well this endeavour, it's what your comfy with screen wise I think here.
Personally, I have both, and use both for different kinds of projects. Roxio I tend to use for simple data dump type projects, Nero i tend to use for more complicated ones.
My rate of coasters was very high with my 1st copy of EZCD.....it was before Adaptec sold off to Roxio....It was also before I upgraded my 1x Mitsumi CD-R to something with "buffer under-run"..