Trimax.
(After all this time? Always! :D)
Tried many. To replace trimax. From pilot, uniball, gel pen. But nothing did better than trimax for me (on basis of this combination "how it looks on paper + speed"). If some other pen was providing better speed than it lacked presentation aspect. And if some pen looked even better (uniball), then my speed got compromised. So, each time when I tried to replace trimax, I ended up coming back to it.
Maybe I am attached to it. Using it since school days when having pen like trimax, pilot etc used to be cool, and luxury to many like me.