Which of these OP trees would you expect to execute more quickly?

gistfile1.txt

Which of these OP trees would you expect to execute more quickly?
(Provided that other than what you see here, they're doing the same thing!)

$ perl_a -MO=Concise -e '@x = @x{1, 2};'
g  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
f     <2> aassign[t3] vKS/COMMON ->g
-        <1> ex-list lK ->c
3           <0> pushmark s ->4
b           <@> hslice lK ->c
4              <0> pushmark s ->5
8              <@> list lK ->9
5                 <0> pushmark s ->6
6                 <$> const(PV "1") s ->7
7                 <$> const(PV "2") s ->8
a              <1> rv2hv[t2] sKR/1 ->b
9                 <$> gv(*x) s ->a
-        <1> ex-list lK ->f
c           <0> pushmark s ->d
e           <1> rv2av[t1] lKRM*/1 ->f
d              <$> gv(*x) s ->e
-e syntax OK


$ perl_b -MO=Concise -e '@x = @x{1, 2};'
e  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
d     <2> aassign[t3] vKS/COMMON ->e
-        <1> ex-list lK ->a
3           <0> pushmark s ->4
9           <@> hslice lK ->a
4              <0> pushmark s ->-
-              <1> ex-list lK ->7
-                 <0> ex-pushmark s ->5
5                 <$> const(IV 1) s ->6
6                 <$> const(IV 2) s ->7
8              <1> rv2hv[t2] sKR/1 ->9
7                 <$> gv(*x) s ->8
-        <1> ex-list lK ->d
a           <0> pushmark s ->b
c           <1> rv2av[t1] lKRM*/1 ->d
b              <$> gv(*x) s ->c
-e syntax OK