Two subs are better because they can distribute bass frequencies better throughout a room for a more even response than a single sub.
Would you choose 1 ou 2 subwoofers for a stereo set?
Would you choose 1 bigger sub or 2 smaller ones?
For a living room 6 x 8 meters (speakers on the smaller side). (3.5meters high)
Mcintosh MA9000 + BW802 D3
I listen mostly to digital audio (DAC / Streamer)
Looking into 1 JL Audio 13" or 2 JL Audio 10"