The right answer depends on the workload profile and the horizon. Colocation wins when the load is stable and predictable: a server amortized over 5 years in a rack typically costs 2 to 4 times less than its cloud equivalent at continuous full load, with full control of hardware, licensing and data location (sovereignty, GDPR, outside the US CLOUD Act depending on the operator).
Cloud wins for elasticity (peaks, seasonality), short-lived projects, and managed services you don’t want to operate. Hidden costs to compare honestly: data egress on the cloud side; power, cross-connects and transit on the colocation side.
The dominant pattern in 2026 is hybrid: a stable base in colocation, burst and services in the cloud, linked by direct on-ramps (AWS Direct Connect, Azure ExpressRoute) available in well-connected data centers.