Question about WOTLK realms

Im new here, i want to start playing on wotlk realms here but i dont know which one is better for me, Lordaeron or Icecrown?

So i got a few questions about the realms, which one is better for PVE, does the dungeon finder works on both realms and is it available to donate gear on both realms?

Better for PvE Icecrown I believe
RDF works only in Icecrown
Donate gear on Icecrown too only. Lordaeron is more hardcore

Conclusion, join Icecrown, more populated, more fun.