I don't know anything about wget. I've only seen it mentioned in phpbuilder.
I know lynx is a browser that some people use to call a webpage in their crontabs. When I tried that, something went wrong and my page was called continually for about 2 hours before I caught. This 'runaway' situation has been mentioned on phpbuilder in the past.
So I prefer to set up my crontabs as I described:
21,51 /path/to/php /path/to/page.php
When php is installed as a cgi (not as an Apache module), it will be a program that resides somewhere on the server. In my case, the path/to/php is the actual location in the file structure is:
/home/apache/cgi-bin/php4
The /path/to/page.php is the actual location in the file structure. In my case:
/home4/RobsFolder/page.php
To reinforce something, these file locations are the for the system's file structure, not for the page locations that you might put into an HTML page.
Hope that helps.
Rob