Depends on your music tastes.
Some people like really accurate sound, not what Bose puts out with the "smiley" face EQ - Bass pumped up 20db, mid down - 10db, and Treble boosted 18db.
For accurate sound, you want your EQ flat lined at the middle. Then test with music you trust, know, appreciate... tested the same way on your other car, your home system - all flat lined too. In cars you should center up the fader and balance too. Then you can truly compare. NOTE, music track to music track recordings (different albums, labels, etc), can vary wildly on the audio output. Some tracks I have pump the bass, others are weak, that I wonder what's wrong some times.
I've listened to $100,000+ custom home audio speakers (7' tall that pivot on a gimbal), that would blow your mind (simply the most accurate out there)... but many people would not appreciate them, until they put the smiley face on the EQ and distort the music from how it was originally recorded.
Everything else is just a mind game.