Training Load
Qualitative athletes never really know what their training load truly is. Even if they are very aware of their body, and its telltale signs, the qualitative athlete can tend to either over- or under-do particular workouts. This type of workout inconsistency will typically result in very similar racing inconsistencies. Some results will be remarkable, while others leave you scratching your head, wondering what went wrong.
Why? Because the actual build up to each race ends up being very different from event to event, as the nature of the pre-race intensities are so variable. As a result, the athlete will load and unload training stress in very different ways, leading into races.
The quantitative athlete, on the other hand, is better able to plan and execute the appropriate training stress, because they know exactly what is going into their training stew, at the beginning of every day, every block, and every season.
But, just as a stew is only as good as the ingredients that go into it, a season plan is only as good as the information on which it is based. That said, it is still very easy to over- or under-do the planning aspect of any particular training session. Even if perfectly executed, any given workout can result in an inappropriate training load for that point in the season.
Race Day Execution
Qualitative athletes go out on race day and rely on their experience to guide their day. In many cases this is a fantastic approach, which can lead to breakthrough performances. Leaving the HR monitor and power meter at home can be very freeing and allow the athlete to really push on performances, otherwise thought impossible.
However, for newer athletes and even seasoned veterans moving up in race distance, racing by feel often requires practice and a bit of trial and error. In long course racing, and especially Ironman, where the opportunities are relatively infrequent, this can result in a great deal of disappointment with the possibility of redemption a long way off.
The quantitative athlete approaches their races with a clear pacing plan, developed around very specific wattage and pace, or heart rate targets, which are always derived from recent training data. Initially, the athlete may feel a bit handcuffed by the pacing strategy, feeling as though it is holding them back. Most well-developed pacing strategies will feel much too easy very early on, causing a bit of doubt to creep into the athlete's mind. But, if executed properly, the pacing will result in a "slow bleed", where the athlete crosses the finish line in utter exhaustion, not a moment before, nor a moment later.
This type of pacing and execution results in the fastest possible triathlon time. Despite racing by the numbers, quantitative athletes must also have an eye on how they feel. It is never wise to race solely by data. The data should be used as a guide, alongside perceived exertion. The two, together, can become a very powerful combination.
Freedom
Qualitative proponents have a clear advantage in this piece of the argument. Reduced stress while training--absence of constant benchmarks and numbers staring you in the face can be a pretty strong selling point. Quantitative athletes have the power meter and/or heart rate monitor dictating every step that they take. And when a workout isn't going as well as planned, that device reminds them of it. There is something to be said for heading out on a ride or run, without that stress constantly present.