VBURST uses AWS T3 processors (https://aws.amazon.com/ec2/instance-types/t3/), which aren’t as powerful as the VPS-1. Same amount of cores, but they throttle after a certain usage (cpu credits) which is tracked in your Atomic dashboard. If your sites are very cacheable and you’re not pushing a ton of traffic, it should work fine.

You also don’t get live chat on those plans, but all the other services included: https://pagely.com/plans-pricing/wordpress-vps-hosting/#plandetail