Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Low/mid range cards won't benefit from having the extra RAM onboard I am led to believe, since they don't have the power to actually manipulate large textures and so on in high resolutions, where the extra memory would be needed. And the onboard memory is slow and cheap as well.
Those two cards would probably perform equally well. What is your friend hoping to play and what is his budget? You don't want to get him a card that isn't up to the task of Doom 3 if that's what he wants to play.