The best traits to breed right now are the ones you love most.
There aren't any "worthless" traits so don't let anyone convince you otherwise. Any gorgeous trait combinations will always have value (there's lots of breeders whose shops are tailored to beautiful cats without factoring in flavor-of-the-month traits or overall new traits) and capture the attention of others who appreciate the aesthetic and the dedication put into the project.
Sometimes I find it's harder to locate particular traits that often get lost because many are fixated on breeding the most recessive (bonus points if it's also new) traits; these are the traits that become more "common" as well in the long run, especially due to the KittyCatS breeding mechanics with easily losing dominant traits for good. Foxie S&P with Ody Bellini eyes? Very recessive, but after returning from my SL hiatus, I see this fur/eye combination more than most others now. [Insert Newest Fur] with Apple and Twinkle, possibly a Pointed Soft Fold? Very nice traits that are often added to a newly discovered fur, but so common since 2012.
Also: I've nothing against new traits, I love new traits, but I will only breed those traits that really "speak" to me (Ugh OdyRoundedFold, you've stolen my heart!) or I can develop a distinct vision for. Ultimately the trait won't be "new" anymore or the most recessive so you should be pleased with the trait on its own without factoring in newness/recessiveness.
For me, I always feel best about my cattery when I'm breeding that which I'm passionate about. It makes me feel even prouder when I get that box that yields me the dream kitty who meets my goal(s) for that particular project, and what a pretty kitty it will be with plenty of gushing at its loveliness.
Everyone is different though so "best traits" to you might mean something totally different from my given perspective. If you're happy breeding Pandie Brown & White 1s and Siamese Chocolates, stay happy and don't let anyone discourage you with stating that either trait may be "too common" or "worthless"; it's all a matter of what
you really and truly want to breed in the long run.
I highly recommend using Tad's awesome
Build-A-Cat to help you set goals based on combinations made that you can be excited about.