Does it even matter? Are covenants going to be the biggest factor? I’ve been on classic for so long I’m kind of going into shadowlands blind.
Race is basically just cosmetic based at this point.
Really the DPS bonus wont make a difference unless you are pushing high keys or World First raiding.
Choose what you like.
If I ever go back horde on my rogue, def will be UD. Orc is probably the best for pvp if you are going to push high rating.
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Technically orc IMHO since they nerfed arcane torrent and you can’t cannibalize in stealth anymore on UD.
Dwarf, that stoneform. 
Orc is a favorite in PvP but it isn’t strictly better in all scenarios/matchups so go with what you like aesthetically/thematically. I’m not sure what’s simming highest in PvE at the moment but that’s even more irrelevant- the difference is always tiny and situational.