Hi MG. I’ve never really thought about it. But in my mind the choice depends on various factors. A 230V one is likely to use less energy when idle or under low load, but a 24VDC one may use less energy when operating or under high load. A 230V one may pose a higher risk of electric shock or fire than the 24 V option bur the 24VDC one may be more prone to interference or damage. But I don't know for sure why one is specifically ask for.

230 volts AC means reliance on mains electricity or on a standby generator or UPS none of which have a great record of reliability.

24 volts DC is easy to supply from a battery, a common application is to vent smoke in case of fire, making reliability crucial.

I would prefer mains voltage over the extra low voltage as in case of a fault it can trip a breaker, consequently visually displaying a fault.

On 24VDC given the large length of the circuit (around 70m) there is a chance the cable may arc for an extended period of time essentially qualifying for a fire hazard although low risk. The 24VDC may not trip the circuit fuse.

Supply to the damper panel is generator backed.