Owning more than one car changes a lot of small decisions, and scent strategy is one people rarely think through deliberately. The daily driver and the weekend car live very different lives, and treating them identically on this one detail is probably leaving something on the table.
A daily driver spends most of its time doing exactly that: commuting, errands, the unglamorous bulk of actual driving. A calming, balanced choice like NINE tends to earn its keep here, something that makes the routine parts of the week feel a little less routine without demanding attention every time you get in.
A weekend car, the one that comes out for a specific drive, an event, a Saturday with nowhere particular to be, can afford to be bolder. This is where ONE or SIX make more sense, a scent with more presence and personality, since the car itself is already an occasion rather than a background part of daily life. You are not going to be sealed in it for eight hours of commuting, so intensity that might feel like a lot in a daily driver reads as exactly right in a car you are already treating as special.
There is also a simple practical benefit to differentiating: it makes each car feel genuinely distinct from the other, rather than two versions of the same experience. Getting into the weekend car should feel like a different occasion than getting into the daily driver. Scent is one of the easiest, cheapest ways to make sure it actually does.