No argument, a 102" whip mounted in the same location will easily outperform any 5 foot antenna... However not everyone can use an antenna that long, and the reasons vary, so when someone posts something like...
Even though the 102" whip will outperform whatever he gets, recommending one really doesn't help him much as for whatever reason he cannot use said antenna.
530, if you take all the 5 foot antennas on the market, essentially all of them will perform about the same, and the ones that don't will perform worse. I know people love their brands, but in reality the brand really doesn't matter much when it comes to performance. For mobile antennas, length and where said antenna is mounted on the vehicle are what tells the tale.
That isn't to say that some brands do or don't have better quality than others, that was strictly a statement about antenna performance.