If the host is enough trustworthy and reliable I can pay annually. I know such reliable host as Surf7.net that accept yearly payment and really cheap and quality
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Pointless... like giving caviar to an elephant.
If the host is stable and reliable enough like, for instance, ch-center.com is the company you can rely on. You can pay both monthly and yearly (but you will save much money if you pay yearly).
Hope it can be suitable information for your request.
Think that it will be a good idea to pay monthly first and see how reliable and stable the host is.
If you are 100% sure in reliability of a web host, you can pay yearly.