I am using Vultr. They have very cheap VPS options and they have many different OS images i.e. I am running a CentOS and a OpenBSD instances.
They have a phenomenal service. Hard to beat their pure raw performance (NVMe, high clock CPU), they offer a host of solution from dedicated to VPS, you truly can’t beat their price (I migrated from AWS to Vultr, Vultr was 8x cheaper for the comparable AWS offering), they have global presence.
I've been using Vultr for a while and am quite happy with them. I've also used a couple of the IPV6-only VPSs for experiments, but I have IPV4 & IPV6 connectivity at home.