Someone once asked George Melly, former Jazz singer and raconteur, "What's so good about Jazz?" He replied "If you have to ask the question, you wouldn't understand the answer!" I'm feeling a bit like that here, but I'll try and answer as best I can!
I've used, and still do use, a lot of different makes of wrenches over the years. I was lucky, as I got steered towards British made tools at an early age. Without that advice I'd probably have bought really cheap stuff, and probably regretted it! There 's no way I'd have paid Snap On money for a wrench back then!
Over the years I've now used tools from a lot of makers, and have pretty much concluded that Snap On are the best! I'm no metallurgist, but I know any wrench is a compromise between strength and hardness, and I reckon Snap On have got it about right. Their finish is second to none (and if you reckon that's an irrelevance, you probably never wipe down your tools after a job) and it's durable too.
Snap On are one of the few firms that broach their jaws rather than just punching them, and you only have to look or feel the inside of the wrench to understand the difference. Most importantly, when you pick up a Snap On wrench it has a feel and balance that few others can match!
Now, there are others that are close! I love my old Britool wrenches, and they are probably as durable. I have metric wrenches by Stahlwille and Hazet and they are really good too, and the relative newcomer Nepros seem to be tackling Snap On head on for quality. I'm aware there are other good makers out there too, Wright come to mind, and this is all good news - competition can only ever benefit the consumer!
Of the Taiwanese and Chinese tools that are out there, I can only say that they are not to my tastes. But, and it's a big "but", some of the relatively cheap Asian tools that I see now are of better quality than some of the dross that was around in the 70's and 80's! We tend to look back through rose tinted glasses and remember the good stuff that was available then, but believe me there was some real **** around too!
Everybody buys a tool based on what they like, what they can afford, and what use they think a tool will get. If you don't think a Snap On wrench is for you, then don't buy it! The only advice I would give is this - don't force yourself to choose between say Snap On and cheapest import! Those are tools from totally opposite ends of the quality spectrum and there's probably something in the 'mid range' that is exactly what you want!