Mix and match. Double it up if it suits you.
Somehow I ended up with YMCA Basic Certification back in the 80s.
Then PADI AOW and NITROX. Then somehow SSI AOW with a few different optional subspecialties. Then SDI SOLO.
What matters most is the instructor and whether you actually learn anything new. Some certifications aren't worth the plastic they aren't printed on, and don't even get me started on the useless Master Diver course, although from what I understand agencies other than PADI actually teach you something new. I think.
Somehow I ended up with YMCA Basic Certification back in the 80s.
Then PADI AOW and NITROX. Then somehow SSI AOW with a few different optional subspecialties. Then SDI SOLO.
What matters most is the instructor and whether you actually learn anything new. Some certifications aren't worth the plastic they aren't printed on, and don't even get me started on the useless Master Diver course, although from what I understand agencies other than PADI actually teach you something new. I think.