Speed-wise, I don't think it makes much difference
Speedwise, it makes no difference. They produce exactly the same code.
$ perl -MO=Concise,-exec -e'$x = qq{a $b c}'
1 <0> enter
2 <;> nextstate(main 1 -e:1) v
3 <$> const[PV "a "] s
4 <#> gvsv[*b] s
5 <2> concat[t3] sK/2
6 <$> const[PV " c"] s
7 <2> concat[t4] sKS/2
8 <#> gvsv[*x] s
9 <2> sassign vKS/2
a <@> leave[1 ref] vKP/REFC
-e syntax OK
$ perl -MO=Concise,-exec -e'$x = q{a }.$b.q{ c}'
1 <0> enter
2 <;> nextstate(main 1 -e:1) v
3 <$> const[PV "a "] s
4 <#> gvsv[*b] s
5 <2> concat[t3] sK/2
6 <$> const[PV " c"] s
7 <2> concat[t4] sKS/2
8 <#> gvsv[*x] s
9 <2> sassign vKS/2
a <@> leave[1 ref] vKP/REFC
-e syntax OK
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