At the moment NukeX is slightly the better tool, but over a couple of years it'll cost you 10x more minimum.
When Demon gets the link wheel feature added it will be a big step (coming in the next month or so according to the devs roadmap)
Nuke $147 per month
Demon $347 for two years (minimum)
Thats over $3500 against under $350 for 24 months use.
Also they are adding sites and platforms to Demon all the time. It now comes with a lot more WEB2's than it came with at launch. I have morte sites in Demon than I can count, 30,000 maybe 50,000 something like that. Wiki's tens of thousands) article sites, WEB 2, thousands of bookmark sites, press release video, RSS well over a thousand directories..I'm scraping and adding more all the time. adding hundreds or sometimes even thousands a week.
But like I say - at the moment - if money is no object, Nuke is the slightly better tool.
If money is a concern there is really no choice. For 10% the cost UD offers 85-90% of the functionality, with more to come (free).
Both work VERY well. I have used X and UD (I've hammered them both) They are both rock solid applications that work and are very well supported.
A rare thing in IM these days where many none subscription products just fail 4-5 months after you buy them.
Sum up - monry no object = Nuke
90% of the functionality for a fraction of the cost = Demon
They are the best tools in this field - it's good to have competition, it keeps the devs on their toes and the prices under control.
Scritty