My all time fav so far that i have the chance to try would no doubt be the NS9900 As for the worse, any racket with steel/wood material
The rackets I hate most are the ovals of the previous generation. The reason being totally different than any above: They r most difficult to string as they have too many shared grommets where U strive to get the 2nd string in. Merry X-mas.
I've never had a real problem stringing ovals. It's not hard to thread shared grommets. IMO the nonshared grommets are much more irritating. But then again, I do love the oval shaped rackets. And I don't like the 4U armortecs. They are too inbetween. Heavy enough to be awkward but not heavy enough to provide any advantage over a traditional balance 3U.
I love the metallix 6K obviously lol. It just suits me perfectly, any HEAD racket is good in my books(so far) My least favourite are BK rackets, especially XL versions of rackets those suck! and i am a singles player too