Depends on you but i would choose essie!!!
Well I think that Essie is better but I would try to get Eyrik to boost that deck.
But between the two listed use Essie. She has one less power but becomes unstoppable after you lose a round.
Lamar Cr (ELO-banned) > Eyrik > Oyoh > Essie, El Gringo > Eyrton, Hammer
And you should really get Alexei for that deck. You're probably on a budget, so Marina and Striker might be little too steep....
I just bought back my alexei but i have to train it
Eyerton is more stable, but Essie is better if bonuses are active and you just lost. Either way, it's not bad.
However essie is situational with bonuses active eyrton is still basically 10,5 in attack differences