Charlaquin
Goblin Queen (She/Her/Hers)
RAW, it simply comes down to if you don't use and role-play the social aspect of being a Half-Elf or Half-Orc, I don't see many people picking humans over the two other races.
The thing is, a Feat is HUGE in 5e. Starting play with Polearm Master, Great Weapon Master, Crossbow Expert, or Sharpshooter puts combat characters at a huge advantage compared to non-humans of the same role. Resilient (Constitution) is the best 1st level feature a caster could ask for, with War Caster and Spell Sniper being great alternatives. You can use a Feat that gives +1 to an ability along with the two floating +1s to get any +2 +1 combo you want. Half-orcs make good barbarians and half-elves are great charisma casters, but variant human is one of the best options for any type of character you could possibly want to play. They pay a small power tax for their versatility, but it is WELL worth it.