Impedance matching 2 Ω or 4 Ω

Hi guys!

I bought a Rockford Fosgate amp (T1000x5ad) and it provides the following output options for the sub:

400x1 @ 4Ω

600x1 @ 2Ω

600x1 @ 1Ω

I think of putting a 10" sub which has 600W RMS

There are 2 models, the DVC of 2Ω (T1D210) and the DVC of 4Ω (T1D410)

In the case of 2Ω, I have to make a parallel connection in order to have a final impedance of 1Ω

In the 4Ω, I have to make a parallel connection in order to have a final impedance of 2Ω

My doubts are:

Which sub should I use?

Are there differences using a certain impedance?

2 Ω is better or worse than 4 Ω?

Changing the impedance changes quality?

Thanks in advance!

Sent from my iPhone using Tapatalk