My thoughts are simply that if you already have a saw and knife I would suggest that an axe would just be needless additional weight to carry unless you plan on doing some quite specialised trips that would validate humping an axe around with you.
Go to any bushcraft meeting where a bunch of like-minded folks gather. Gasp in awe at the sheer number of Granfors Bruks axes gathered in one place. Gasp in even more awe at the number of them that have sliced some paper to test the edge, whose masks are unmarked and unblemished, never having been carried in weather or used in anger. That is not a reflection on the owners, merely that a lot of folks part with their hard earned with every intention of giving their shiny new GB axe a long working life, and then they promptly struggle to find work for it.
That said, I'm a complete hypocrite because I currently own 2 GB axes, half a dozen restored vintage axes in various sizes and a couple of my own make in Damascus
Axes are very useful tools in the right circumstances - my own opinion is that about 99% of currently owned bushcraft axes are unnecessary weight to carry and that probably >90% of axe owners have to find work for them to do that could just as easily be done using more efficient, convenient and lighter-to-carry tools.
The vast majority of my axe use is in gathering bowstaves and working them down into roughed out longbows, where I am effectively limbing trees or felling young trees up to 6 or 8 inches or so in diameter and removing a lot of excess green material to allow the almost-bow-sized green wood to season faster. If I wasn't gathering bowstaves I can honestly say that an axe would never even make my kit list for general bushcraft trips. At best I would add a larger knife to the knife/saw combination I mentioned earlier. The exception would be the few canoe camping trips I've done in Canada for a couple or more weeks at a stretch, when the axe begins to make itself useful. If I planned a prolonged stay or trip somewhere, the axe would be right up there back on the list of must-haves.
I honestly think that the majority of bushcrafters could very easily never own an axe for their entire life and not miss it. I am soon going to be selling or swapping my GB mini hatchet and Scandinavian Forest Axe (which makes the SFA look like a box of crayons by comparison) purely because for over two years now they have had precisely zero use. Carried often - used rarely.
The Scandinavian Forest Axe is, to my way of thinking, a truly useful camp axe. The SFA is just too small for the big stuff and a little too heavy in prolonged one-handed use for the smaller stuff. That is why I ended up with a mini-hatchet and a Scandinavian Forest Axe - my SFA went the journey within 48 hours of buying it while the mini-hatchet did a lot of short trips and worked great for firewood, kindling and carving work while the Scandinavian Forest Axe did proper camp duties wonderfully, which the SFA struggled with by comparison.
Ask yourself what you plan on using one for that your current setup has not been able to do for you. Fuzz sticks are much, much easier with a knife. Tent pegs, triggers for raps or cooking pot hangers can all easily be whittled by sawing and then a bit of knife work. So, what is your grand plan for said axe ?
If you can find a use for one then you can probably narrow down the best choice of the two you mentioned for yourself. I can't help wondering whether your indecision is due, in part, to any uncertainty regarding its intended use.
Axes - a lot of fun and very efficient tools if you have the need. A waste money to buy and of energy to carry for the majority of outdoors folks.
Just my opinion, for what it's worth.
Good luck with whatever you decide