It depends on particular vendor and harvest. If you don't like Pai Mutan (white peony), that's just because the one you bought wasn't good. The best Pai Mutans are absolutely incomparable. They're cheaper than SN and in theory of lower grade but when I compared the best Pai Mutans with the best SNs, it was always a wash, SNs have more buttery sweet flavour while PMs have a more balanced overall aroma and more prominent almond notes. Nominally I consider SN to be my favorite tea, but considering lower price, Pai Mutans are the best value in teas and are tied for the top spot even if you disregard the price. Of course, that's only as far as my taste is concerned :-). Oh, and if you brew a really good Pai Mutan - no zoo there, not even close.
Actually, Pai Mutans do have one flaw - even the good ones will have a somewhat rough aroma on their brewed leaves, but never from the tea itself, and never from dry leaves. It's really pretty weird and amazing - it always surpised me how this offputting aroma can be pretty strong in the wet leaves but not even the slightest shade of it is transferred to the liquor. All the good stuff is brewed out of the leaves and bad stuff only is left!
That's one refinement of SN - they're good all over, the buds that are used in SN are 100% free of that problem. It's not a big deal, though, the taste and aroma of the tea is what matters, wet leaves are thrown out anyway :-).