I have played both RQ and HQ extensively, and for me the major difference is in the way equipment and items are managed. In RQ, if two warriors have both Sword 90% but one of them has no armour and the other one wears a full plate, you know which one is going to survive
In HQ, if two warriors have Bad-Ass Warrior 4W1 and one of them has Full Plate Armour 17, the outcome is not that obvious. The armour may give an augment, but then the other player can probably augment with some other skill (Hate Lunars or Fight to the Death or Initiate of Humakt) and the fight will be even.
So (independently from power level) I'd recommend RQ to players to whom equipment matters, and HQ to players who just like to come up with good ideas (which translate in bonuses) during play. Also HQ handles high level play better but is not necessarily restricted to that kind of gaming.