If "better" means "better than local disk," then with GCS you don't have to worry about managing the disk size, replication, or even keeping the machine up. You can host your PHP clients in a serverless environment (say, Cloud Run) and pay next to nothing for small amount of usage. At the same time, your data will be very safe. As a side effect, when your internal users access the data, you can use granular access control management, audit logging, etc. out of the box with GCS. With bare disk, you need to manage all that yourself.
For boot disk sizes, see this. (TL;DR 64TiB)
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