As said before I mainly use torx T-25 screws but some of the shorter ones come in T-20 and cabinet head torx in T-15. I've pulled some out of treated wood that have been in for 15 years and they come right out. I have occasionally got some soft drivers that will strip out after a while especially if not engaged straight up and down but I look for the better quality ones.
The only other thing I use are the hex head type barn screws. At least those don't strip out. Have an electric impact wrench for putting barn tin on roofs and siding.
I used the square head stainless or aluminum (I forget) screws that were recommended for a composite deck going in treated lumber underneath about 15 years ago. Had to remove a number of boards last summer to change things around. A lot of those square head screws either stripped out or broke off. Use vise grips to get the stripped ones out or just pried the board up screw and all. Now I need to go look to see if the screws were the tapered Robertsons or the straight square ones. And then look to see which bit I was using as I didn't know there was a difference. As I recall, the bits had a taper and if the screws were not the tapered ones then that may splain things. Will check them later today.
I just know that Phillips will automatically strip out either going in or coming out of treated lumber unless using extreme down force to keep them seated and then go slow and use a start and stop with the drill to maintain the bite and avoid cam out when hitting a tight spot.
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