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I like these, have them on my front and back steps - I've had to replace a few boards and have had no trouble pulling them out.
https://www.leevalley.com/en-ca/shop/hardware/fasteners/screws/wood-screws/69600-grk-fasteners-rss-screws
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Torx probably a better option for decking, but For decking I’d go for a sinking head. I remember @mikenetic has an impressive deck he installed himself using slotted stainless heads.
Are your screws stainless steel? They’re the recommended choice for decking but most installs I’ve seen don’t use them as they are a bit more expensive. I used stainless on my deck mainly because I had all the problems Bobbo described removing the old ones, and ended up buying a recip saw and cutting it all out. Obviously if the heads are sound unscrewing is a better way to go, but it will take a while. It took me a whole day to put 1,000 screws in, with pilot holes, with two cordless drill drivers, an impact driver, and spare batteries to swap out on the charger.