For a solid VPS, look for NVMe storage, KVM virtualization, and a Ryzen or EPYC CPU. Those three give the best speed for the price.
Ask the host if the bandwidth is truly unmetered, or if the speed gets slowed after some usage. Also check if the CPU is dedicated or shared, since shared CPU can slow things down at busy times.
Start with a monthly plan, so you can test uptime and speed yourself before paying long-term.