[CentOS] Choosing VPN Server

Hi,

I am facing a task of choosing vpn server. I do not know which is better.
The one distributed with CentOS4.5 only supports pppd (or maybe pptp but I
cannot find it).
If* *I want to use PPTP or L2TP, which one should I choose? OpenVPN? Poptop?

Thanks.
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