I'm going to grossly oversimplify here (so I'll duck to avoid any incoming as a result

) but for me this can often be very easily be answered by exploring your planned/anticipated use and selecting/buying based on that. Boring, I know, but there we have it...
Many small axes punch way beyond their weight
if you know how to work with them properly. You can use a small axe to very quickly make a bunch of wedges that allow you to split and process very large logs,
if you need to.
Most larger axes are a pain for smaller tasks (another gross oversimplification) although there are some very worthy exceptions to this very general rule.
For me there is very little middle ground, but that is largely down to how I work which tends to be a little different to how many folks go about their bushcrafty business. It's not necessarily better, or worse, but it suits me.
If I am planning a long trip where I expect a lot of brush clearance, limbing, or even felling (not usually in the UK, unless I am gathering
a lot of bow staves) then I reach for my Scandinavian Forest Axe (assuming I was going to use a Gransfors axe at all). More often it would be a 3/4 Norlund Hudson Bay or an Elwell.
For pootling about the woods in the event that I might need to do a little axe work, a GB Mini Hatchet works for me since it literally fits into a coat pocket and can cut quite large material with the right technique. It's great for carving and for kindling, and its small size and low weight are very favourable.
The Swedish Carving Axe is great at what it does and I like it for roughing out longbows, but I prefer something smaller and with a different bevel for most of my longbow work (note that I once again refrained from posting
that picture

)
For me the SFA is too big for small work and too small for big work and, for me, is neither fish nor fowl. I can see why it could work well for a lot of folks, but it doesn't work well for me and I sold mine on the day after buying it.
Keep in mind that someone my height (6' 4") will typically have a very different cut with the same size axe as someone 5' 4", so that probably accounts for a lot of why the SFA doesn't work as well for me as the Scandinavian.
The dynamic is very different depending on many things, including height, weight, relative strength to weight ratio and, above all, technique. Alter any one of those and things change pretty quickly.
One-size-fits-all tends not to.
There is no right or wrong to this - if you are comfortable with what you have that's fine. If you aren't, you need to look at how the axe is edged and helved, see if there is something that can be done to/with the tool to improve matters, adopt a slightly different technique and, if that fails, sell it and buy something else
Knowing how to use an axe is infinitely more important than the axe itself and is one of the key elements that is often overlooked and, ironically, it should also be one of the primary driving factors to selecting an axe when looking to buy.
The fundamentals are settling on your planned use and working within certain parameters. Most splitting and/or felling axes make poor carving axes while many good carving axes are less capable at splitting and/or felling.
Requirements analysis: identity your requirements and seek out a 'best fit' solution to meet those needs.
I still say that
most outdoorsy folks won't/don't need an axe of any type for the majority of UK trips.
I'm off to wash my mouth out...
