Do you prefer to use a separate receiver battery or Voltage booster regulator.
The way I see it by having a regulator just adds another point of failure into the system, but in return adds convenient where you just plug in the main battery and go and not worry about having a separate receiver pack to charge or took a dump when you accidentally forgot to charge it.
On the other hand, having a separate receiver pack is more reliable and bullet proof and also the benefit of extra current overhead for power hungry servos. But the trade off is it's just adds another pack of battery to charge after a few runs, and if you don't keep a careful look out on the remaining charge it could take a dump on you by surprise during a race.
I fly model helicopters and I always choose to have the receiver battery over the bec or voltage regulator any day, for reliability sake. just the battery connected directly to the receiver, no switch or regulator in between.
But that's model aircraft, I'm more concern about it loosing control and coming down and hurting someone.
Since this is on a car I don't have to worry about this situation.