The Hobby Boss 'Dutch Leopard 2A5/A6NL' is a good kit, with all the parts to make a Dutch A5 or A6 in the Box (no expensive surgery required). It also includes a set of accurate Dutch markings (taken from an actual vehicle, 83-KP-98), but there are only two of the rectangular black Convoy markings included

, also the blue on the small flags looks a little to light for a Dutch flag.
There are a few small fit issues, but these are easy enough to overcome with some putty and a sharp knive. The only real mishtake that HobbyBoss made is with the loader's hatch, which they have depicted with a similar swivel mount as the commander's hatch. They have completely missed that the loader's hatch has an 'up and over' hinge, with two large springs. Two other annoying mistakes are the air intake wire mesh, which has a wrong pattern (punched holes, rather than the woven mesh), and the anti-slip panels, which are to thick.
I'm working on the review, which I hope to finish in the next few days (circumstances permitting).
In brief, the kit is better than the Revell/Italeri one (it has the right skirts, finer detail, and MUCH better baskets.) I have not build the Tamiya one, but the Tamiya one needs additional (expensive) surgery to build a Dutch 2A5/A6. The HobbyBoss kit is also about half the price of the Tamiya kit.
If you want a German A5/A6, the Tamiya kit fits the bill. If you want a Dutch A5/A6 from the box, I would recommend the HobbyBoss kit. If you want a Danish or other 'essoteric' version, keep an eye on HobbyBoss future releases...