The AIC10 is a tiny bit colored but not any more so than the Egoista (ie in a good, subtle way). Plus you only have one tube to change and you can shape the sound any way you choose.
As for the 465 I've never heard it as they're so rare. But I've heard great things from people who own it, it's basically at the same level as the Riviera and the Viva. At that insanely high level it's more a question of preference than any of them being better.
One thing the AIC10 has the Mass Kobo doesn't is that it can drive certain loudspeakers on top of HPs. As a matter of fact I use it just like that, with Susvaras and Spatial Audio X3s, and it sounds equally brilliant with both. So convenient...