Both (assuming comptent devs) have the scope to become great games.
In your case, with your love of PvP, i agree, i don't think ED will ever be the game you want. The smaller scale of SC and lack of modes means its much more PvP "friendly". However, there are those in the SC community who really don't like the idea of getting pad rammed or being blown up as they exit the safety zone around stations, and will not appreciate being told to git gud or fly a something better (when perhaps they can't afford anything better), and some who just want to chill. They backed SC based on the dreams CIG sold them (PvP sider, NPC to Player ration 90 to 10, with NPCs being indistinguisable from players (LOL!)).
For the moment, they can still dream. Limited players on a server, the PvP guilds/clans/whatever not really in full swing perhaps, no real loss, so griefers perhaps not so interested yet, and they can always fall back on "its early days, its alpha" to assuage their concerns about how the final game might be, and it allows them to continue dreaming.
As things get closer to release, or upon release, they might find that the game isn't what they expected, and the forum wars will truly start, akin to what we have here. And CIG might listen to those people, and make changes which make the game less PvP friendly, and that will then upset the PvPers.
Dreams are easy. Reality sucks.