First off, if you can’t determine the difference, then the tools are not for you.
That’s not being snobby, just practicality. I can’t tell the difference between a mid price bottle of wine, and one at four times the price, so I buy the cheaper. I wish it were the same way with tools, but it’s not.
What makes them “high end”? The quality of the steel, the accuracy of the manufacturing, the hardening, the finishing, etc etc.
Let me explain it this way. If you are doing some types of work (e.g. some aerospace tasks) there are specifications the tools have to meet. Some of these specs are quite demanding (e.g. a socket wrench might need a relatively thin wall, but still be strong enough to take a certain torque).
Most manufacturers don’t offer tools that meet these specs. Some, offer a range of tools that do, but they are expensive. Often more money than Snap On. But with Snap On, ALL of their sockets, and the accessories, meet the specs. Same for wrenches, etc etc. It’s quite an achievement, and I don’t think any other manufacturers can match it.
I bought my first Snap On tools over 30 years ago. I paid more for a set of sockets and a ratchet than I ever had. But I’ve used those tools for 30 years, so they’re not looking so costly now.
But… I wouldn’t buy everything they sell. I buy the tools they make (sometimes called the “hard line”) - sockets, wrenches, screwdrivers, etc. Buying something that they buy in and rebrand would not be sensible.
And times are changing. Snap On are getting very expensive. There was a time there wasn’t much difference in price (for me) between Snap On and, say, top end German. I bought Snap On. Now, Snap On is 2 to 4 times the price of the German. And Snap On have started cost cutting. A pair of Snap On pliers now, are not the quality of 30 years ago. So while I have a good deal of Snap On, I probably wouldn’t have so much if I was buying again today.