[meetdilip]

Since almost an year Google's algorithm does not favour websites which are not responsive. ie, you need to use a script which adjust itself to different screen sizes. You can always choose not to go with it but that would be at cost of " Mobile Friendly " tag vanishing from your site in Google search results. Google prefers that you offer a mobile friendly version of your website as mobile device users who browse web are in increasing nos these days.
Among CMS, both WordPress and Joomla are mobile friendly. They can adjust themselves according to screen sizes.