An interesting thing about Garak’s speech that I’ve observed-
Andrew Robinson has said that he played Garak’s speech pattern as though he had very recently learned to speak Federation Standard (maybe about a month before the show starts, while the Federation was on Terok Nor making the withdrawal negotiations).
Now, for the most part, Andrew uses close to his own natural American accent. But sometimes, Garak pronounces words like Julian does, as in with an English accent.
Since Julian is the person Garak talks with the most, and he very recently started learning Fed Standard when they meet, Garak is picking up some of Julian’s speech patterns.
I find this a subtle and interesting connection between them.
(While on the topic, Julian and Garak pronounce each other’s names differently from how everyone else seems to).