I've read about if "z" sound is pronounced /z/ or /dz/ and found the answer here that:
Typically, though not consistently, [dz] occurs at the beginning of a word or in the middle of a word immediately following a syllable-final consonant (§5.1, §5.6), and [z] occurs in the middle of a word immediately following a vowel.
So I thought: okay I need to just remember which word uses which sound. Then I heard native speakers saying:
絶対にだめです。with /z/ sound
そんなことは絶対できないじょ。 with /dz/ sound
So seems like the SAME word can have both pronunciations, depending on person?
My question is should I care at all? Maybe I should choose one sound /z/ or /dz/ and use it in every word? Will everyone be able to understand me?
Thanks for help :)