My resume is in excel. When it needs to be emailed I .pdf it. I think it is a question of which program you are most comfortable making tables in. I find that with excel my tables are already there. I also have a mac, so the .pdf thing is wicked easy.
Another nice feature of excel is the "hide" funtion. My resume currently has every show I have ever done on it. I can then format my resume simply depending on who I am applying to. If the theatre does mostly classics then I take some of the contempory work, etc. (though perhaps word has this funtion as well- not to sure, I just know excel best).