Jack Leigh Harkness in his book 'Roses' said he'd have given Prima Ballerina a 10/10 for fragrance but he only gave its offspring 'Fragrant Cloud' a 9. Personally, I prefer 'Fragrant Cloud' - a good wafter in the garden but even so not my favourite rose to sniff.
I've been a little disappointed with PB. The flowers, unlike what I had expected (though there were copious amounts of them) didn't appear to be useful to bees, they looked pale, unspectacular and didn't have a very pronounced fragrance. To me it was more like an odour, sweet granted but something that you might find in a detergent or bathroom product. If you like those kinds of smells then I heartily recommend 'Mum in a Million' over PB. 'Mum in a Million' is a much better plant and its scent is complex and interesting.
'Reconciliation' by Harkness - now that has a beautiful smell - something like a freshly opened ripe corn cob with sweet rose, apricots and cloves.
'Caprice de Meilland'/'Best Friend' also has a clear, distinctive fruity smell - raspberry and blackcurrant.
'Fragrant Plum' one of my faves, smells at its best in early Summer and late Autumn (here in the UK) when the flowers are darker.
I have yet to test Prima Ballerina in the vase, to discover how pervasive her scent is, we're only in July but there don't appear to be any any flowers left to try out.
My favourite rose for fragrance in the vase is the mystery one which I'm trying to identify - please see my comments on the 'Rosenresli' (by Kordes) pages and the 'Norma Major' pages, HMF.