This doesn't make any difference in your case; so I'd use '$' to avoid confusion.
IMO, using $ causes confusion.
To those who know the difference between \z and $, it
confuses what the code does
To those who don't, it perpetuates their confusion.
Note that \Z (capital) is equivalent to (?-m:$) (i.e. does what $ does not under //m) even when //m is on. \z (lowercase) always is just the end of the string.
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