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If it’s a VPS for enterprise, and you expect the enterprise to grow (even slowly), go for CentOS. You can switch to RHEL when you can afford it, and they provide true enterprise-level support. They even handle the transition for you. You have 10 years (lifetime of a CentOS release) to prepare for the switch.
If it’s your own VPS, or it’s for a non-profit organization, then go for Debian. You need to upgrade every 2 or 3 years, but it is not very painful (according to this blog). Upgrading Debian through SSH should not be risky. Debian is stable enough for free distributions, and I uses it in my VPS.
When it comes to documentation, nothing beats CentOS. If you need tutorials/guides for something, you’re almost sure to find it for CentOS and not always for Debain. But debian is simpler in terms of configuration files, especially since you’re used to ubuntu.
anyone have a comparison of use RAM DEBIAN 8, UBUNTU 14, CENT OS 6/7 thankyou.