Some very interesting replies here, my first LP12 was fitted with an SME 3009 series II improved fixed headshell, because at the time early 1970s BG (Before Grace) it was considered THE only tonearm for the serious (and I was a very serious teenager at the time, it was my first deck, first tonearm, first system) I have probably tried more tonearms on an LP12 than almost anyone, some no one here would even have heard of, I wont list them as it would get very boring and I would forget more than a few of them.
I really think the Ittok and Ekos work best on the LP12, I'm not a Linnie, I don't own any Linn equipment at this precise moment. I don't know how much of this is down to design or chance. The Ittok was inspired by the Breuer type 5A (yes I owned the 5 and the 8) but if you have them side by side you would never guess, the "Fletcher arm", "The Arm", or Sumiko MDC-800 was also inspired by the Breuer (but mainly it's extreme rarity, Erhard Breuer could only make so many after all). The Breuer is a work of art, in every way, the Brinkmann is not even close (yes I've owned one and every other arm I mention). And yet the Ittok on the LP12 was better, it's not that the Ittok was a better arm, it's just that it really "works" on the LP12, I have never encountered a more remarkable symbioses, or hyper compatibility with any other Hi-Fi equipment. The Ittok (and obviously the Ekos) compensates for the LP12s failings both in the bass and the high frequencies (if this was by design then it remains Ivors finest moment). There are tonearms that do better in specific aspects but none that are as musically valid with the LP12, yes the Aro is more relaxed, the Breuer more transparent, if I ever own another LP12 (I've had around six) it will be with an Ekos (II or SE) or an Ittok.
I'm certain that you, dear reader own a Tom, Dick or Harry tonearm that ticks every box, that you "know" is far better than a 40 year old (well next year) TickTok, but I would say that if at all possible you should try an Ittok/Ekos, by try I mean live with it for a month, not just a few hours, forget about listening to whatever you usually listen to when "assessing" Hi-Fi equipment, forget about all that nonsense and just enjoy the music, then you will hear everything without even trying, if you then don't agree with me, I'll buy you a Beer!
PS the first 3 "almost production" Ittoks to arrive in the UK traveled on a first class seat, not in the cargo hold, (I told you they were special), not a lot of people know that.