Leather thickness per dollar
The Razorback's upper is noticeably thick for a boot at its price - comfortably thicker than Thursday's and approaching the heritage American boots. Jim Green publishes its construction and does not hide behind "premium leather" language, which on its own puts the brand ahead of most of its price bracket.
Red Wing's Amber Harness is still the better hide: tanned in-house, oil-rich, and it ages into something the Jim Green does not quite match. But the gap is smaller than the price gap, which is the whole point of this comparison.
Where Red Wing's money shows
The repair path. Red Wing's own stores resole with original parts, and the company runs a repair shop at the factory. Jim Green boots are stitched and therefore resoleable, but you are entirely in the hands of a local cobbler - which is fine, and is not the same as a factory that will rebuild the boot to its original specification.
Sizing is the other practical gap. Red Wing's lasts are widely documented and most people can work out their size from the internet. Jim Green's sizing runs its own way, and the return trip from a South African maker is long enough that getting it wrong is a real cost.
No membrane, and why that is a feature
The Razorback is water-resistant through the leather and its treatment rather than through a membrane. That is a genuine durability advantage: there is nothing to delaminate and nothing that will clog. A Gore-Tex boot is more waterproof for its first few years and then becomes worse than an untreated leather boot once the membrane goes, and the membrane is the one part a rebuild cannot restore.
The cost is maintenance. An unlined leather boot is only as waterproof as its last wax treatment, which means a tin of Sno-Seal and twenty minutes twice a winter.
The verdict
Jim Green if you want thick full-grain and stitched construction for the least money, you are confident about sizing, and you are happy to use a local cobbler.
Red Wing if you want the boot that the factory will take back in 2040, and if the better hide and the documented repair route are worth roughly double to you.
There is no wrong answer here, which is unusual on this site. Both are genuinely repairable boots with genuinely good leather, and that is already a smaller club than the market suggests.