Spamcop reports are munged, so that your email addy is protected. However, spammers increasingly embedd your email into the title and body of the spam, so its an increased hassle to manually delete them before you submit a report.
Nucem exposes your email, but ISPs take these reports more seriously.
It's always a balancing act when it comes to fighting spam at source. Some spamfighters get joe-jobbed for this, so the risk is always there. But the personal satisfaction of having taken some proactive action in quelling spam rather than being victimised without recourse pays for itself.
The good thing though is that reporting spam to ISPs and web-host providers have become very fast and efficient. So I can easily nuke my 10-20 spam mails I get a day in about 1-2 min flat.
For me, I use both Nucem and Spamcop to simultaneously report each spam I get whenever I have the time.
Doing 10-20 emails a day on Nucem and Spamcop together take about 5 min, but its become like a stress-relieving pasttime for me.
I still have my SpamAssassin spam filter in my Inbox to quickly sieve away the trash into the Junk Mail folder ready to be nuked.
But for those who want an easy way out beyond just simple filtering, then SpamArrest seems to be the best option in the mid-long term.
Human verified sending of email may be a pain to some, but it works very quickly. And takes away all the problems of false positives that could happen when clients want to contact you.
I still like nuking spam though, so the day has yet to come when I convert to human-verified email