I've been back and forth on this myself. I carried a Huntsman exclusively for decades and found the corkscrew really useful for knots, etc. I prefer the Explorer setup, with the inline Philips head and the corkscrew. I know you can't get quite as much torque from the inline Philips, but there's nothing out there to replace a corkscrew.
Phillips driver, you could still try to use the can opener tip to make do. But I lean towards the corkscrew because it is a tool that has no replacement, and it is a total party pooper when it is missing. Besides all those uses mentioned, it also host the small screwdriver which comes in handy quite often for me.Btw, if does become a dilemma for you one day, do check out a mod I made in the past--"Mountain Tinker"
The difference between the Fieldmaster has phillips and Huntsman has the corkscrew all other tools are the same. The Huntsman does come in a lot of flavors ( scales ) as it a really popular model. I was hardcore believer that the backside phillips was better to have than the corkscrew. I now believe the inline is the best and so the corkscrew is a nice complimentary tool for any SAK. The can opener is underrated and not talked about as much as it should as good phillips driver but its terrific.The uses noted about are some good ones. I dont get a lot of use from it but I've used it to pull wall anchors which was super cool. I've used it to untie knots. I used it when a friend had wine but forgot the corkscrew. I always house the mini driver there.
I have been the hero of many parties with my corkscrew!
With all your guys replies, I was going to order a Fieldmaster. Then Huntsman.couldnt decide...so I got a....SwissChamp I hate when that happens