RAID vs AHCI

Dear dell community members,

would you please help me choosing the right settings for BIOS configuration.

I have Dell Inspiron 7566, I upgraded my SSD to Samsung 970 pro nvme

I have another drive which is Seagate firecuda SSHD

my question is should I keep the default BIOS settings with RAID or should I change it to AHCI??

What is the pros and cons of each choice??

Please help me