In my oppinion the best vampire weeknessess are
1)withered stomach
It doesnt effect my sims since they dont eat human food.
2/3) day phobia
Only because they dont effect u much since u hardly go out in the day any way. I go uo yo version 2
4)undead slumber
If u want to be traditional and be a proper spooky vampire this weekness is for u. i choose it since really does effect your game much
5)fitfull sleeping
Lol i choose this since well u can just hibernate in coffin duh.
Warning! Never get eternal sadness your vampirr crys all the time and starts doing weired acyions that scares your kids if u have them. Please say if u qoukd prefer or change any of them for when i next play that mod