Both of above do not really affect PvP capabilities of a character..
i disagree. int gives you more skill points, which means your character can get to pvping faster. but i also agree that int implant is kinda useless if you get it on a high level, but you can just reroll if that's the case. if you can't reroll because you have other implants on your character then yes, that's a problem.
end implant affect pvp for sure, if end implant was buyable, everyone would make a 9 end character and use that 1 point for smth else. 1 point is not game breaking, but why would they do that?