Which upgear ratio

malossi 136 with reedvalve, phb25 & zirri silent

I already have a 2.56 gearup but prior to the build I am considering which setup would suit my requirements best. i’m not building a race motor, so will be aiming for fast round town and good cruising capability for rallies .

a) 2.56 with standard et3 gearbox

b) 2.56 with zirri short fourth

or
c) 2.34 with both the above gearbox options

I notice different schools of thought seem to surround the ideal primary drive setup and would welcome opinions [?[]