Not sure what priorities come into news editors' heads, but given the positive comments about Higgins from O'Sullivan, I think it's hardly surprising that he got mentioned.
I was never a massive fan of Higgins, but he certainly had flair and perhaps a style which O'Sullivan has followed (usually 'speedy' in taking shots).
Certainly saw him go far in many tournaments though never clocked up the wins like Steve Davis, Stephen Hendry and so on.
As for Duisburg vs Higgins, you can use Newsnow.co.uk and search (free for one keyword) and yes, there are more individual articles about Duisburg, Germany, but primarily from only European news websites.
Searching for Higgins gets fewer results - in Europe there are articles from Malta, Turkey and Netherlands, plus UK and Eire) but outside Europe, articles appear in Australia, NZ, Philippines, Indonesia, Malaysia, Bangladesh and the Middle East, but even Pravda has a piece (didn't even know the Russians were interested in Snooker!), which shows some significant recognition even though Higgins has probably not played outside Europe in past 10 to 20 years.