Whenever a service or protocol is not needed perse on a system, leave your fingers from it. Telnet is a protocol that has security implications as have all server/client protocols. You could read more about it here: http://tn3270.umsystem.edu/en/help/tlsoverview.html
You could consider Putty, but again if you do not need servers/clients run, stay away. Every extra service you run is an added security risk period.