to my knowledge, taprite regulators are fairly 'standard'.
the regulators that most of us use (myself included) are the cheaper, single-stage regulator with npt connections. they will generally last quite a while under good conditions, and you may need to replace the diaphragm at some point (it may be cheaper to get a new regulator entirely though)
the regulator pictured in the first picture is a victor regulator, meant for welding applications. harris also makes some regulators along these lines. most likely, it is a dual-stage regulator, which is necessary for welding applications since in welding applications the consistent flow as well as pressure are important. for us, pressure is all we care about, we don't need a certain flow.
generally speaking, the victor/harris regulators will outlast our brewing career. they are generally at least twice as expensive though, and use a different thread. honestly, we don't need dual-stage regulators, but the reliability of a victor is top notch.
this isn't to say a taprite or a perlick or a cornelius regulator is 'bad', they should all work just as well as the victor as far as we are concerned, but the craftsmanship and build quality don't really compare, i think. there is a reason why you can buy a new regulator for 30-something for us, and why the victor welding regulator is closer to 100 (maybe more? i don't quite remember).