Big Y700 is probably the most important test for paternal lineages that you can take. Here's an analogy to help explain - The Lewis and Clark Expedition with an aviation twist:
Lewis and Clark's primary objectives included "explore and map the newly acquired territory, find a practical route across the Western half of the continent." They left St. Louis in 1804 and arrived at the Pacific Ocean late in 1805. In this analogy, we can think of the Pacific Coast as our genetic genealogy homeland, the place or status where our genealogically known family connects specifically to the Y DNA tree of mankind. The Pacific Coast is not the same for all of us, as each of our families has a distinctive location. Lewis and Clark founded what would be Fort Clastrop on the edge of Astoria, Oregon. From Astoria Column, a tower, you can see the Pacific Ocean, the Cascade Mountains and the Columbia River.
Single SNP testing is like flying a two seater from St. Louis and hoping to land in Astoria without knowing where Astoria is. The plane is low priced and reliable but has bad gas mileage. More importantly, Astoria may not even have coordinates on the map yet or a landing strip. This kind of approach is most applicable when someone who is highly probable to be on the edge of your genealogically known family has already done a Big Y test and has built a very tall tower or lighthouse to go with a new landing strip. That tower in Astoria could be thought as a super version of Astoria Column and it is built with 111 Y STR markers.
Fixed SNP panel/pack testing is like flying the two seater from St. Louis hopscotching across the country, landing at a handful of small airports and getting out and taking a good set of photos at each location and then deciding the next location to fly to. Fixed SNP packs/panels are a low entry price way to go, but suffer the same problem any fixed SNP test suffers. What if your Astoria hasn't been discovered? Perhaps, even your State of Oregon has not been discovered. You also might have troubles if your eyesight or navigation system isn't so good. For good navigation you'd want to have at least 111 Y STR markers.
Big Y Discovery testing is like having a super high speed, fuel efficient jet traversing back and forth on multiple paths high across the sky on mostly clear days taking special photos of the countryside between St. Louis and the Pacific Coast. It is scanning over 14.5 million locations. If your Astoria turns out to be San Diego, Long Beach or Tacoma, that's okay. Big Y is accomplishing what Lewis and Clark were doing, mapping the route for settlers to follow in the form of lower entry price tests. Unfortunately, your family of genealogical record might not even be on the maps for the mass migration of settlers to come, that is without Y SNP discovery testing like Big Y. It's just a fact of the Y chromosome just as it is of the geography. The settlers won't go to a place when they don't know where it is or even know it exists.
Only a member of your genealogical family can discover your Astoria and erect the Astoria Column of 111 STR markers for the settlers. We need leaders in each family.
I'm asking you to start thinking about Big Y if you haven't already. Be a lead-explorer! There are now several thousand Big Y results in just for the R1b haplogroup now. It works. Big Y results can come in as quickly as 4 weeks (FTDNA uses an 10-12 week estimate). Pooling of resources at the project/family/surname levels can help share the cost, but be looking for Holiday, DNA Day, Father's Day sales promotions.