which kbs???

im looking to run 9.1-9.5 compression in my motor with a xe274 what kb piston is better for it the kb232 or the kb107 becasue i heard with the 65cc head the 107 will be at like 10-10.5 compression and with a 65cc head the 232 will be at 9.1 because its 9.3 at 63cc so what pistons are better if im looking to RUN 91 Octane at most