Definitely the Borg as they appeared in the series.
The introduction of the Borg Queen is, for me, one of the lamest moves TPTB ever made. The hive mind with which one cannot directly reason gave the Borg a kind of zombie horror.
The Borg queen reduces the terrifying drones to servents of another tacky Sexy Sexy Danger(TM) villainess to pseudo-intimidate, but then be destroyed by, the hero. That rubbish was old when Rider Haggard did it in the 1880s and it hasn't gotten any fresher with time.
Wow... I thought I was the only who thought this way. I totally agree. The QUEEN ruined the borg..utterly..