Wirelessly posted (8700g: BlackBerry8800/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)
I prefer and use BBSmart. The developer is an active member here also.
Neither will tell you it is true HTML, but they do quite well, and BBSmart's add to calendar or task feature is a great option for me.
You'll find lengthy threads and opinions on both in the Aftermarket Software section here.