I much prefer AUS8 to 8CR. It's tougher, yet easier to sharpen. 8CR has seemed brittle to me, holding a fine edge on light cutting longer, but losing it quickly on medium duty cutting and being much harder to get back. Again, just my opinion, but I think 8CR gets brittle faster than AUS8, making the industry standard 58-59 RC being too hard for it.
The Ontario Utilitac is a hefty and tough knife. If you only want partial serrations, I would go for the recurve model since the tanto is over serrated in my opinion, and it places the serrations to where you don't have as much hassle resharpening the recurve.
The RAT is a great basic EDC and cutter knife, but the UT2 has tougher liners and the liner and stop pin are further apart making it to be likely tougher than the RAT. The RAT is no slouch though.
Just my opinion, but the Chinese Spydercos aren't worth their price. You mentioned camping and hiking, which to me dictates occasional hard use. Spydercos break easier in the first place at the spydie hole with the flat grind, and add the brittle MOV steel and it's no wonder there are numerous accounts of them breaking. It's still a good knife, but my Tenacious was no where near the same league my Utilitac is, yet was almost twice the cost. Realistically, they're made by a company who makes $10-$15 knives. They're good at making $10-$15 knives and that's about what I think a fair price for the Tenacious would be, but I have no experience with tye model you're looking at.
As for the Boker, just don't. Boker is the king of finding $5 Chinese knives and selling them with their logo for a 1000% profit. I may get trashed on for this, but Boker is just rebranded crap unless you pay over $300.