EAP/TLS/CHAP versus open SSH

Hi, Iam planning to secure telnet/http connections from any linux/windows box. for this iam using pam_opie PAM module which basically is one form of OTP(one time passwd) authentication module. The authenticator is a linux box, so should i go for open ssh or PPP protocol like OTP (using pam_opie PAM module). open SSH also has Challenge response implemented. But it might be slower due to asymmetric encryption. I think in my use case, the authenticator has TCP/IP stack i should go for SSH or SSL with http instead of PPP protocols. Please let me know your comments/suggestions. Regards, Sudarshan