That is interesting result. Some Onoto pens at the top, others near the bottom...
What was the factor(s) for some Onoto to be near the bottom?
Is there certain model of Onoto I should (or shouldn't) pursue?
Remember my caveat about unreliable ranking. My bottom-ranked pen is one with which I have no intention of parting, an Onoto 21. It performs perfectly albeit with a very wet No 15 nib. That is useful for inks needing plenty of flow, like RO Yellow Sunset or Green Olive. So, how did it get down there? Probably because it is one of my three smallest pens, useable only when posted, so that pushed it down, then it lost out to other small pens which are vintage Watermans and also lost out on "vintage", "significant" and "attractive" (that last may be a little unfair). I paid only A$30 for it already restored. There is one probably needing restoration on Oz ebay now.
In contrast, the other low-ranked Onoto is a slightly temperamental 6234 in a very nice red marbled pattern. Based on some recent discussions we had I have a couple of ideas to sweeten its behaviour. The No 5 nib is soft and tends to dry, and to skip unless your touch is very light. However, that is not a condemnation of the 6234 because I have another which ranked much higher. Looking at where they lie, I think several black ones lost out from lack of attractiveness or significance, whereas a 3000 (the original slim cylinder), 3050, 4601, 6000 and 6411 (the top Onoto) climbed on performance.
It is a bit chancy, I am afraid.