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I see two different forms in Bash scripts which seem to do the same:
`some command`
and
$(some command)
What is the difference between the two, and when should I use each one of them?
There isn’t any semantic difference. The backtick syntax is the older and less powerful version. See man bash, section "Command Substitution".
If your shell supports the
$()syntax, prefer it because it can be nested.