Tracker is easier to live with
Tracker can suit people who are comfortable with variable pricing but do not want to plan around half-hour slots.
You still need to accept that the rate changes. But you are not deciding whether 12:30 is better than 18:30, or whether a dishwasher waits for a specific window.
That makes Tracker feel closer to a normal tariff in daily use.
Agile has more upside and more timing risk
Agile can reward flexibility more directly. A battery charge, EV session, washing cycle, or immersion heater run can be placed into cheaper periods.
But bad timing shows up quickly. Heavy use during the evening peak can undo the benefit of cheap overnight or midday slots.
The question is not just which tariff has the lower headline rate. It is which tariff matches how the household actually uses power.
Example
Imagine two households both using 10kWh.
Household A uses more overnight and delays flexible loads. Household B cooks, washes, dries, and charges devices during the evening peak.
On Tracker, their timing may not matter much for that day's unit rate. On Agile, Household A may do much better than Household B.
Practical check
Think of Tracker as the simpler variable option and Agile as the timing-sensitive option.
Use the Compare page with realistic split assumptions. Then check whether the Appliance timer actually finds usable cheap windows for the loads you can move.