BCom with 15 year experience in IT - 262112 or 263211

Hello Mr. Anil,

Below is a breakup of the max 75 points that I could theoretically score:
Age: 38 (25 points)
English: 20 points
Education: B. Com (15 points)
Employment Outside Aus: 15 years IT related work (15 points)

I’m working in the IT Information Security Domain. I found 2 closest possible job profile match in the SOL. One was ANZSCO: 262112 (ICT Security Specialist) under MLTSSL (Assessment Agency = ACS).

The other was ANZSCO: 263211 (ICT Quality Assurance Engineer) under STSOL (Assessment Agency = Vetassess).

What will be the main differences in the application process for each of them?
Does STSOL also provide a PR or is it just for a short period of time?

If my employment opportunities will only be limited to one state/region under STSOL is MLTSSL a better option?

Which one would you recommend?

Since I did my graduation in B. Com, how many years of experience / how many points will they deduct?

I have Information Security related certifications of CISSP, CISA, CISM, ISO27001 Lead Auditor.

Will they be given any weightage in the evaluation process? Will there be a separate Skill Assessment that I would need to clear?