Hi Pokem
I have both Sorel and Lundhag boots - though not the Jubilee Hunters you're asking about. Both are RBLTs (rubber bottom leather tops) but are pretty different from each other.
The Lundhags are absolutely top quality - mine are around 15 years old and on to their 2nd or 3rd re-sole. I use them in cold wet weather when I'm likely to find myself bogtrotting and river crossing. Part of the reason I like them is that if I need to cross a river I can take off my boots and socks, take out the insulating insole and put on just the boots - wade across, and then, because they have no lining or liner, I can just wipe the inside dry, put my dry socks back on and carry on with dry feet. Try that in normal lined and padded hill boots and your socks just become saturated from the water coming back out of the boot lining. Provided the leather top is properly cared for then the boot shell is waterproof and the lower part being made of rubber won't lose its waterproofness after a few hours of trudging through wet bogs in the way that other all leather boots will.
The Sorels too are high quality, but they are something else entirely - they are for real cold and snow. They are by no means a hill boot and they aren't stiff enough to either kick steps in crusted snow or to cut through ice crust with the side of the sole. The rubber shell of the Caribou Evolutions in the pic aren't tough enough for rough work either IMO but they do make ones with Steel toecaps IIRC. However I would be very confident in them outwith the hills or steep ground and if you really need to keep your feet warm then they're the best way to go. The liner in mine is made of felt and once it gets wet either from condensation or if you let water in over the top of the boot (it's shell is watertight otherwise.) then you will struggle to get it dry - it can take ages. I have just bought a second set of liners for mine and actually if I was going to be out in the wilds in real cold with them for a long time then I would consider taking a third pair of liners.
The Lundhags are one of my favourite pairs of boots - they excell in Scottish moorland conditions and the quality is second to none. The Sorels are what I reach for though when the snow is lying thick and the temperature is dropping, (provided I'm not heading for the high hills that is.)
Hope this helps.
George