I voted Medium quality/detail at 30fps, but it really depends on the game. I would probably tweak the settings myself to get somewhere between the two. For example, I could disable or tone down stuff like anti-aliasing if I play in 1920x1080. That way I could keep the nice textures but have the environment look a bit more angular.
It depends to be honest if the game has just good base line graphics but is fast paced and requires no lag or at least tittle lag to be playable, then I will opt for lower graphical settings but if it's the other way around I'll raise em.
I play for fun so the Better graphics is what I'd prefer.
I would say it depends on the genre. For instance playing a game on 30 Fps is easily playable in most cases without any real noticeable stalls in gameplay. However I think it also depends on the game genre. For instance it's more crucial to have 60 FPS for games like first person shooters, Mobas, where reaction time is more crucial where as rpgs and strategy games ( games where you control an army) isn't as important. Now MMO's I'd say is a hit or miss depending if your doing pvp or pve content. PVP= high FPS crucial, PVE= 30 FPS reasonable and little impact on outcome since most pve content in MMOs is kinda predictable assuming you know how certain creatures fight.