I believe I have listed all of my current ink collection in my signature, but just in case I should change it one day:
- Diamine: Amaranth, Ancient Copper, Asa Blue, Bilberry, Classic Green, Earl Grey, Eau de Nil, Golden Brown, Macassar, Majestic Blue, Oxblood, Sargasso Sea, Syrah
- Lamy: Black
- Noodler's: Heart of Darkness
- Rohrer & Klingner: Alt-Goldgrün
- Sailor: Jentle Yama-Dori, Nano Sei-Boku
Out of all of these, my favourites are Yama-Dori, which is extremely close in colour to Diamine Eau de Nil (another favourite of mine), but with more vibrancy and sheen; Alt-Goldgrün, a beautiful spring colour in my opinion; Ancient Copper; Asa Blue (I'm told it's very, very close to Pilot Iroshizuku Asa-Gao); Earl Grey; and Majestic Blue.
Classic Green has a sort of status quo - I like the colour very much, but I'm sure that I'd find something very similar with more red sheen and maybe even other additional qualities if I actively looked for it. Oxblood and Syrah are close contestants for my favourite red colour, but I kind of want to try Red Dragon and maybe some other reds as well and see which one has the most interesting appearance (sheen?).
Sargasso Sea is very vibrant yet still extremely boring, it shows no shading and less sheen than Majestic Blue and doesn't have as much colour depth. Golden Brown and Macassar don't wow me, but they're nice enough to use from time to time when I want some diversion. Amaranth and Bilberry are the two colours that I don't use except when there's a specific occasion for them, I'm not a fan of vibrant pink and violets in general. Lamy Black is just that, a lame black that literally pales in comparison to Heart of Darkness.