When it's all said and done, I generally prefer NBC Sports' coverage (and CBS Sports' for that matter) to ABC/ESPN- that's just my personal opinion. I notice ESPN often fails to capture or deliver all the drama, excitement and personal stories of many of their televised events- instead resorting to cheesy fluff and relatively unexciting reporters. This is only in general- it doesn't hold for all cases. It's tough for me to explain clearly...you really have to look at nuances to understand.
But all I know is ESPN/ABC's coverage of skating, and hence that's what I'm used to. I've never seen an NBC skating comp. broadcast outside of the Olympics, so I can't tell for sure how it's all going to play out.