It doesn't make a difference, but if you want to write something after the variable, it's treated literally unless there's an \E. That's a common mistake I made, so I always haven an \E for every \Q.
Example:
$ perl -Mre=debug -e 'my $x= "*"; /\Q$x.+/'
Compiling REx "\*\.\+"
Final program:
1: EXACT <*.+> (3)
3: END (0)
anchored "*.+" at 0 (checking anchored isall) minlen 3
Freeing REx: "\*\.\+"
You see that the .+ is also treated literally.
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