Some spiders are a little of both, creating "catch nets" instead of elaborate static webs.
That's what I meant by a "spectrum" - orb-weavers are on one extreme end, and jumping spiders are on the other. There are other types of spiders that take up positions in the spectrum somewhere between the extremes.
I use these types of spiders in talking about evolution somewhat frequently, because it illustrates a point, at that. People tend to get this idea that evolution always goes "onward" and that it "progresses" and is moving towards some "perfect animal", but that's not how evolution really works - it just adapts species to different niches.
Orb-weaver spider webs are nearly invisible, but nearly immobile, and only work against flying insects. They are slow and clumsy and nearly blind, so they just spin a web and wait for fliers to get caught. Crawling insects simply don't crawl on a orb-web, so they never get caught.
Jumping spiders have good eyesight, powerful legs, and can simply run down a crawling insect. They hunt crawling insects because no matter how well they can jump, most flying insects are just plain going to stay out of range of a spider they can see. So they focus on crawlers.
Each is adapted to hunting a class of insect, but here's the thing - when one class of insects becomes more common, spiders start evolving to "switch sides" to hunt after the more plentiful types of food. Web-spinners might spin less elaborate webs, and try to instead regain their speed and eyesight by first become trap-door spiders that ambush crawling insects. Jumping spiders who have forgone their web-spinning for thousands or even millions of generations may try to spin small nets they can carry with their legs and catch their flying prey by jumping and snagging some prey that way.
They evolve back and forth however often they need to in order to take advantage of the most common forms of prey. The spiders that are between the two extremes are either hedging their bets, or in the middle of evolving to a more specialized predator.