atWar Silverlight (or SL for short) is the original version of game, which is based on the Microsoft Silverlight browser plug-in. This version had existed in one form or another for the past 5 years.
atWar HTML5 is the new version of the game that is completely plug-in independent and will work in any modern browser (including mobiles & tablets). It doesn't require any additional installs and works right away.
As per above, since the old version relies on a proprietary browser plug-in, it is not future-proof. Google Chrome, for example, have already dropped support for Silverlight this September and even the new Microsoft browser, Edge, doesn't support it. Inevitably, other browsers will follow suit. Another reason is that Silverlight doesn't work on mobile devices.
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