There are a number of considerations you'll need to take into account when deciding which colocation provider to opt for.
If your business has mission-critical needs then you'll want to reduce latency. Additionally, you may need to look for hosting on the west coast for optimal Asian connections, east coast for European ones, or mid-state for the best general connectivity across the US. However, you need to ensure that the geographic siting works for you, by balancing a combination of network connectivity, resiliency, and disaster recovery considerations, as well as ease of access.
All providers should be able to offer different cabinet sizes to suit you, plus different power configurations according to needs, on top of standard security and redundancy measures across the data center itself to protect client hardware and ensure it runs even in the event of a power outage.