[strongSwan] Different Crypto library

[nima chavooshi]

Hi
I have found some details on different crypto library on this page:
http://wiki.strongswan.org/projects/strongswan/wiki/IKEv2CipherSuites

On this page there some explanation about supported crypto library as below:
 x default built-in crypto library
 o OpenSSL crypto library
 g Gcrypt crypto library
 a AF_ALG userland crypto API for Linux 2.6.38 kernel or newer
 k Linux 2.6 kernel

It means that every library itself implemented cryptography algorithm. Now
my question is:
Which crypto library is fast and more reliable? and which one do I use?

Thanks in advance
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