Melting souls with cuteness since 2007
Eko isn't spoken much about, I'm not sure if Eko has really gotten wide distribution though. (I've not seen it in any local store)
Eko is great at 2players, it's a very direct and tactical abstract game.
Samurai is more strategic and less direct, since you're drawing random pieces with varied strengths you have to puzzle out placement.
Both games are excellent and I own and enjoy both, Samurai is highly regarded for good reason and I would say that Samurai has more of a wider appeal. However, if you like playing abstract games with your 2nd player then perhaps Eko would be a better choice.
I don't think you can go wrong either way honestly.
Both are super good.
...but they have very different feels. Samurai, to me, feels like a thinky abstract while Eko is played more casually around our house. They both are as deep imo... but one "feels" more casual, even if technically i know this is not true.