Shared, cloud, VPS or dedicated: which one do you need?

The four categories are not four quality tiers. They are four ways of dividing up a physical machine, and each one trades cost against isolation and control. Picking well means being honest about which of those you need.

Shared hosting

Many sites on one server, sharing its CPU and memory. It is the cheapest option and it is entirely adequate for brochure sites, portfolios, small blogs and most local business websites. The limitation is that you are affected by your neighbours and you cannot install software at the system level.

Choose it when your traffic is modest and predictable and your site is built on something standard.

Cloud hosting

Your resources are allocated from a pool rather than pinned to one machine, which means a traffic spike does not immediately become an outage and a hardware failure does not take you offline with it. This is the right default for a site that makes money — an ecommerce store, a booking site, anything where an hour down has a cost.

Choose it when traffic is variable, growing, or when downtime is expensive.

VPS

A guaranteed slice of a server with root access. You get isolation and you can install whatever you like — a specific Node version, a background worker, a database tuned your way. You are also responsible for it. An unmanaged VPS is a server administration job, not a hosting plan.

Choose it when the application genuinely needs system-level control, and someone is going to maintain it.

Dedicated

The whole physical machine. You take it for sustained heavy load, for compliance requirements that forbid shared tenancy, or for workloads that need consistent I/O. It is the most expensive option and the least elastic — scaling means provisioning another box.

The signals that you have outgrown your plan

• Response times climb at the same time every day, when your traffic peaks
• You are hitting the plan's resource limits often enough that you have started checking
• The site slows down during backups or during someone else's activity
• You need software the host will not install
• An hour of downtime now costs more than a year of the upgrade

The last one is the honest test. Everything above it is a symptom; that one is the business case. Until an outage costs real money, the cheaper tier is usually the right answer, and upgrading later is prorated anyway.