Which browsers will it work with ?
html5 will make material difference to our web/ mobile users.. People who work behind firewalls, can't typically install the software application or use Java applet based trading as java also is blocked from installation.. In such places the html5 version will give you streaming data..
The good thing with html5 is that it automatically adapts to the mobile/tablets.. So you would not need a mobile version at all, you could just use the html5 version..