Quite interesting thread, I must say.
Started with not too precisely formulated question it collected a lot of equally inaccurate answers and finally turned to fixed blades despite the starting question about folders. Hmm....
Not the same league... Mostly yes, but not exactly. The most of Cold Steel folders have typical lightweight construction molded handles of thermoplastic material without any load-capable metal frame. They could be compared with SPYDERCO lightweights or BM Accent series knives. Throwing asides some odd designs what are intended rather for cool look than for real life use (dont want to name them, probably you know what Im talking about) I could suppose that it is nothing wrong with their sensibly designed lightweights. Being made of decent materials at the same Japanese factories where SPYDERCOs are made why should they be worse, especially at their price point?
BENCHMADE is known mostly as the manufacturer of high-end metal frame based so-called tactical folders what are incomparable with CS lightweights nor in price neither in capabilities.
However there is at least one model more (aside from comparison BM Accent versus CS Voyager) what could be compared CS Ultralock series versus BM Griptilian family. Both designs are based on load-capable metal frame supporting thermoplastic material scales, both have fully ambidextrous locks what work similar way and they are comparably priced (OK, BM make their knives in USA and this makes them somewhat more expensive).
My personal choice would be BM Griptilian over CS Ultralock and among lightweights SPYDERCO Delica or Endura over CS Voyager series knives (btw, and over BM Accent series knives).
However this choice is pretty subjective and I have no objective reasons to support it. Simply my liking and caprice...
The knives are not any black magic, they are pretty simple and easy to understand items. Just look somewhat deeper, ignore cool look factor and try to see how it really works. This could save you a lot of disappointments preceded with not too justified expectations.