To show various person's successes , by using certain machines, does not in-&-of-itself mean that "machine x is the best". I agree that, over time, if "brand x" seems to always rise-to-the-top with the best finds/most #'s, then sure. But to randomly show singular shots of finds, or singular shots of groups of users, doesn't conclusively show a certain machine or brand is better.
Because ANY brand can assemble a list of their best customer's, pose them in a group photo, and admittedly those guys could have some impressive finds. The real test is to pit side by side machines over flagged targets, to see what machine can get the signal, with correct "call", etc...
Also some of the environments that the X3 and X5 might excell in, yet would fail miserably in other environments where alternate brands/models would do better in.