It seems to me that both the Guardian and the Telegraph have provided a different slant on the findings - though the Guardian article is far more informative and detailed. So magpie's comment "Guardian bias as usual" is, I think, misleading.
As I understand it from the Guardian article, 30,000+ Britons are in receipt of unemployment benefit in other EU countries. Three times as many Britons claim benefit in the EU's relatively richer countries as do their nationals in Britain - and benefit rates in those countries are substantially higher than in Britain.
I think the Telegraph article is emphasizing the fact that in effect no Britons claim benefit in the poorer Eastern European countries but that around 35,000 Eastern Europeans claim benefits here.
David Cameron has said he wants to stop foreign job seekers from claiming benefit here and to deport them if they do not find a job within six months. If he was allowed to do this (and most commentators seem to say this will not be permitted), that would presumably mean that, on a reciprocal basis, the 30,000+ Britons receiving benefits in other EU countries would no longer be eligible for them and would have to return to Britain.