Compliance & trust
It depends on data, latency, and the maintenance team. Not on abstract "sovereignty."
On-premise isn't automatically "safer." It's just "a different responsibility."
In short
Choose on-premise (a solution run on your own infrastructure, at your location or in your data center) when you have strictly regulated data (medical, critical financial), when compliance requires complete physical control, and when you have an internal IT team capable of maintaining GPUs (Graphics Processing Unit — a specialized graphics processor used for running AI models). Choose a private cloud in the EU when you want rapid scaling, more predictable operational costs, and don't want to maintain hardware. For 90% of companies, a private EU cloud is the correct answer.
- On-premise: complete physical control, but your maintenance
- EU private cloud: rapid scaling, GDPR (General Data Protection Regulation — the European regulation on data protection) friendly, no hardware
- 90% of business cases → EU private cloud
- 10% (medical, critical financial, defense) → on-premise or hybrid
When on-premise is the right answer
Three cumulative criteria: strictly regulated data that cannot leave your infrastructure (certain medical, military, critical financial data), an internal IT team capable of maintaining GPUs and models, plus sufficient volume to justify the hardware investment over cloud.
When an EU private cloud is better
Otherwise, almost always. Rapid scaling without hardware investment, isolated environment per client, GDPR compliance by default, no physical maintenance responsibility. Reputable providers: OVH, Hetzner, AWS Europe regions with confirmed EU residency.
The hybrid solution — the most common in practice
Sensitive data runs on self-hosted models (Llama, Mistral) in a small on-premise or private cloud infrastructure. The rest runs on cloud models (OpenAI, Anthropic) with anonymization at input. You decide where to draw the line — and you can move it anytime.