In web-based software, security issues are a problem the provider should take care of. Since there is no required software for you to download, it is much more convenient to trade. And, web-based Forex trading software is also much more convenient for Forex traders who travel a lot. This is because you can access your Forex account anytime and anywhere you are in the world as long as there is an active internet connection.
However, in web-based software, you have to pay a minimum monthly or annual fee for maintenance unlike in desktop-based software, you usually only have to pay a one time fee for download.
Both types of software has its own advantages and disadvantages, it is up to you to determine which kind of Forex trading software can benefit you most. Try to consider your lifestyle when it comes to choosing which software you need. For example, if you travel a lot and you need to access your Forex account frequently, then the web-based software is the right software for you.