basis for eligibility

[cclp]

Hello all - here's my situation. I've been married to a US citizen for 25 years, I've been a permanent resident for 14 years, I've obtained the green card based on marriage to a US citizen.
What option should I choose in the "Basis for eligibility" in form N-400? Does it make a difference at all which of the two viable options I pick?

Thanks!

[newacct]

If you qualify under both the 3-year and 5-year rules, it's better to apply under the 5-year rule as it will be simpler and not require evidence of living in marital union with your spouse.

[cclp]

Thank you - that is what I was thinking. However I called the UCSIS and the person who answered told me that since I applied for green card based on marriage, then I should also do the same for citizenship. That is why I got confused.