Opinion: Small motors more or less consistent than big motors?

From personal experience and talking to others racing in the Stock class, it appears that the more HP a car has, the more consistent it is. Bigger engines tend to naturally have more HP and torque. But other factors are carb size and other performance modifications. Properly tuned and hooking, the same engine with a 4 barrel will be more consistent than a 2 barrel. Dialing from one day to different conditions during the next day is more difficult for slower cars. There does "appear" to be a few exceptions to the rule as I've seen some consistent slow combos.

In a nutshell, weather (temperatures, humidity, barameter, wind, etc.) affects lower performance combinations more than higher performance combos.

One, however, can sometimes learn the quirks and patterns a lower performance combo has and dial accordingly.