WEP is unsecure and whoever still uses WEP can just turn off the WLAN security. There is no difference. It doesn't take longer than 10 minutes to crack the WEP key. WPA is secure. But unfortunatly the security is as powerfull as the WLAN password ist. There exist tools which try to crack the password with brute force attacks.
That works if the password is simple or contained in a dictionary or can be derived by social engineering. A long random key is secure. This site generates a random key and you can trust your WLAN is secure. But you should save the key at a secure place (USB stick, encrypted Disk, ...) because you can't remember the key any more if a new client should connect to your WLAN.