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Spade bits are usually made for removing larger amounts of material and will tend to have more length to accomodate a deeper cut, you are looking at what is generally the smallest spade bit but they go up to like 2". Less accurate, but you can also drill a much larger diameter with a weaker drill than with a drill bit of the same size due to the differences in cutting geometry where the spade bit doesn't want to pull itself and bog down the motor.
Spade bit has a lot more room to rock in its angle so a hole can travel a lot more in any direction depending on the angle of the bit. A bradpoint will hold itself more to the hole it drills since the flutes will be guiding it through the hole and acting as support on the walls. You can still wallow out a hole with a bradpoint but it's much harder to do
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Still bradpoint. Angle doesn't really matter as long as the bit is still going straight.