In hardwood, softwood, or MDF, I've had good luck with using the coarse thread drywall type screws (flathead phillips). They are threaded all the way to the head, and have deep, sharp threads. These can be purchased with either phillips or square drive, and some a combination of both types of heads. I don't use tapered wood screws.
As for installing screws, I drill a pilot/countersinking hole (one bit). I like to use a cordless, on the slowest speed, as there is good torque. IMO, using a VSR electric drill is more difficult to control speed than a cordless. Driving a screw fast, will create heat, and likely have the propensity to break off heads. I drive screws slowly and when close to tight, just bump the trigger to pull up the screw.
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