Dear Richard: I agree with Sirspeedy: there is no " best cartridge " per se.
Like Lugnut, I think that the tonearm makes a great difference.
The exercise where Doug and Lugnut participate: Universe/Olympus it is only a " great analog time " but really don't tell me which one is better. It only can tell me some differences between them: maybe these differences ( for the better ) are because one cartridge makes a better match with that tonearm, we can`t be sure.
In my opinion the only way to really knows which cartridge is better that other one is to find to each cartridge the best tonearm match and do the audio tests in that way.
You have a plus on the Titan because they take the helikon in exchange. For me the Titan could be my first choice, as a fact the Titan is a top performer.
Now if you want to have the best cartridge you have to find which one is the best with your tonearm and find the best for your personal audio quality priorities.
There are many top contenders outside: Transfiguration, Dynavector XV-1, Allaerts MC2 Finish, Clearaudio Insider, Ortofon MC 7500, Van denHul Colibri, Denon Dls1, Koetsu Rosewood Signature Platinum ( in the right tonearm ), Lyra Titan, Ikeda Rex9, Benz Micro LP, ZYX Universe, Shelther 90X, etc, etc. You have a lot of top cartridges options.
Regards and enjoy the music.
Raul.