Hi guys. Whats the recommended spec for a servo in a M03 ??

My old Futaba has a few issues, needs to be replaced.
Does the M03 actually need high speed & good torque ??
I have a few to choose from, I just not sure which one to use, from Fut 3003(& Sanwa equivalent) & BlueBird BMS-631 all the way up to hi-speed Ko-Propro

Cheers