Deployment process for production environment

Hi,

What is the best way of deploying cartridges in production

1. Hot Deploy - Directly deploy the cartridge, no matter if same cartridges already existing on the server

2. Undeploy the already deployed cartridges and then deploy the updated cartridges.

Note:- Cartridges are not versioned.

Generally projects take the path of Hot Deploy as doing a Undeploy purge all the running order and they don't want to do that in production environment.

But can this Hot Deploy cause issues?

Can it cause issues like future dated orders not starting as per the expected dated or infact not resuming at all.