Those are all good choices. I agree with your number one choice, the Slayer. The Enduro is also a solid choice. I would look at other bikes before the Trek however.
You say Enduro bike, are you planning or racing enduro or just looking for a good all mountain sled? Might be helpful to know where and how you intend to ride this machine. 150-160mm travel bike can be great for Ontario but can also be a bit much if you’re not taking it out of province on some adventures or riding Blue. Will this be your daily driver?
Agreed with @fasttimes on avoiding the Fuel. Those proprietary shocks aren’t a whole lot of fun to deal with a decade later and a fair while beyond seeing Trek move to other designs. My take away from my experience with the Specialized FSR linkages of that generation was that it pedaled particularly poorly unless it had a functional brain shock or was locked out. No experience with the Slayer, but based on the older Enduro/Fuel models I have ridden he Slayer would be my pick.