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There's no single 'best' — it depends on your stack and requirements. Market share in Australia (2024 Gartner estimates): AWS ~32%, Azure ~28%, Google Cloud ~12%, others (Oracle, IBM, local providers) ~28%. For most Australian SMBs, Azure is easiest if you're already in the Microsoft ecosystem (Office 365, Active Directory). AWS has the broadest service range and most mature AU regions (Sydney since 2012, Melbourne since 2023). Google Cloud excels in data analytics (BigQuery) and AI/ML (Vertex AI). For government work, all three have IRAP-assessed regions, but Azure has the strongest government adoption in Australia due to its Protected-level IRAP assessment.

Yes, AWS has two Australian regions: ap-southeast-2 (Sydney, NSW) — launched 2012, 3 Availability Zones, full service range including EC2, S3, RDS, Lambda, and all major services. ap-southeast-4 (Melbourne, VIC) — launched November 2023, 3 Availability Zones, designed for disaster recovery and data sovereignty requirements. Both regions support Australian data sovereignty — your data stays in Australia. Latency from Sydney CBD to ap-southeast-2 is typically 1–3ms. AWS also operates 8 CloudFront edge locations across Australia (Sydney, Melbourne, Perth, Brisbane) for content delivery.

Australian cloud regions are typically 15–30% more expensive than US regions for the same instance types. Examples (on-demand pricing, 2024): AWS t3.medium — US-East-1: $0.0416/hr, ap-southeast-2: $0.0528/hr (+27%). Azure B2s — US East: $0.0416/hr, Australia East: $0.0528/hr (+27%). Google Cloud e2-medium — us-central1: $0.033/hr, australia-southeast1: $0.043/hr (+30%). The premium reflects infrastructure costs, power, and lower scale. To reduce costs: use Reserved Instances/Savings Plans (up to 72% off), spot/preemptible instances for batch jobs, and right-size your instances — most Australian businesses are over-provisioned by 30–50%.

IRAP (Information Security Registered Assessors Program) is the Australian Government's framework for assessing cloud providers against the Information Security Manual (ISM). You need IRAP-assessed cloud services if you: handle Australian government data, work on government contracts, process data classified as OFFICIAL, OFFICIAL:Sensitive, or PROTECTED. All three major providers have IRAP assessments: AWS — PROTECTED-level assessed (ap-southeast-2). Azure — PROTECTED-level assessed (Australia East/Southeast + separate Government regions). Google Cloud — PROTECTED-level assessed (australia-southeast1/2). For non-government businesses, IRAP isn't mandatory but demonstrates security maturity. If you handle health data, consider the IRAP + HIPAA equivalent (AU Healthcare) controls.

Yes, all three providers support hybrid cloud for Australian businesses: AWS Outposts — AWS hardware in your data centre, same APIs. Available through Australian partners (Kyndryl, DXC). Azure Arc + Azure Stack — extend Azure management to on-premises, edge, and multi-cloud. Strong in AU enterprise. Google Anthos — hybrid/multi-cloud platform based on Kubernetes. Good for container-based workloads. The most common hybrid scenario in Australia is Microsoft on-premises (Active Directory, Exchange) migrating gradually to Azure with Azure Arc managing both. For latency-sensitive workloads, consider Australian co-location providers (Equinix Sydney, NEXTDC Melbourne) with direct cloud interconnects (AWS Direct Connect, Azure ExpressRoute, Google Cloud Interconnect).