Erudites are loved pretty much everywhere. As an erudite necro I imagine you can go to both freeport and neriak. If not you should be able to get the faction needed easily. My erudite wizard is welcome in both outpost and firona in kunark, and I can go to any city but the ogre/troll one. Neriak is slightly dangerous to me, but it's not a problem if you know where not to go.
One thing you should consider is a necro will be able to do a lot more than a rogue. You can go explore a dungeon and get xp at the same time. As a rogue you could only sneak around and look.
Rogues are more desirable than necros for groups though in general. Against undead however you will probably be pretty high in desirability so if you feel like grouping being in a undead area will probably help a lot.
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