I have the best answer for your satisfaction with step by step technical comparison
!. Interface:
Both services share the same basic template, with an email list pane in the center and folders on the left. Account options and settings are located in the upper right corner. In Gmail and Yahoo Mail, a search bar is displayed prominently at the top of the page,
Yahoo Mail sports a very clean, clutter-free design. The folders on the left – Inbox, Drafts, Sent, Spam and Trash – are clearly labeled, and additional folders can be found in a drop-down menu. Just above the folders is the Compose button, which replaces the email list pane with a blank email when clicked. Above that are tabs that let you view Mail, Contacts, Calendar, Notepad and Yahoo Messenger. The icons make it clear which tab you're clicking on, but if you're still confused you can hover over them and tool tips will appear.
Gmail's design is slightly less intuitive. Common email labels (different than folders, see Organization below) like Inbox, Sent Mail and Drafts are displayed on the left, but other labels such as Spam and Trash are accessed via a drop-down menu that's hidden behind the Hangouts pane, which shares the same space on the left side of the screen as the labels. Hovering over any of the visible labels causes the Hangouts pane to shift downward, exposing the remaining labels.
Unfortunately, Google doesn't include any visual or textual indicators that explain how this works, which can make it unnecessarily confusing for neophytes. Furthermore, although you can remove the Hangouts pane by clicking on a small chat icon at the bottom left of the screen, the icon is easy to miss if you don't know to look for it.
Accessing your contacts in Gmail is another point of confusion – to do so you have to click on a drop-down menu just above the Compose button labeled "Gmail" and then select Contacts. As with the Hangouts pane, Gmail lacks any indicators (beyond the Help menu) that explain this functionality.
2. Organization:
Gmail provides a robust set of tools to keep your inbox organized. To begin with, you can categorize your emails using labels, which are functionally similar to folders (with a couple of key differences). Existing labels include Starred, Important, Sent Mail and Drafts, though you can create as many new labels as you’d like.
Unlike folders, you can apply multiple labels to a single email, which is helpful if you have overlapping categories such as Shopping and Shipping Updates. Labels can also be nested and color coded. Gmail displays the labels in the email list pane, allowing you to see at a glance if any emails in that category are available.
Gmail also allows you to de-clutter your inbox without deleting emails outright by archiving mail. Archived messages disappear from the email list pane, but remain in your account. You can find archived emails by using the search bar at the top of the screen, clicking on its label on the left side of the screen (if a label was applied), or clicking on the label All Mail.
3.Advertisement:
Depending on how you've configured your inbox, Gmail features two small and unobtrusive advertisements located just above and below the email list pane. The ads are text-only, and take up a single line of space. However, if you're using Gmail's new tabbed inbox, which separates your emails into categories like Primary, Social and Promotions, you won't see any advertisements at all. -
4.Storage:
Gmail offers 15GB of free storage, which sounds like more than enough space to save all of your emails without deleting messages. However, the storage is shared with Google Drive and Google Plus – which means that if you're saving large files to Google Drive or uploading lots of pictures and videos to Google's social network, you might quickly run out of room in your inbox. If you need extra capacity, Google offers monthly storage plans that run from 100GB for $2 per month to as much as 30TB for $300 per month.