The Sony Movie Studio Platinum 12 Suite is a complete package for video editing, audio editing and disc-creating and it differs from its powerful relative, Sony Vegas 12, only in being short of some top-grade features (and capacities) for top-grade productions. The package comes on an installation DVD and includes Movie Studio Platinum 12, Sound Forge Audio Studio 10 and DVD Architect Studio 5, all from Sony and it also includes Red Giant's Magic Bullet Quick Looks, an application you'll surely use, a collection of about 100 "film look" presets for your projects.
Movie Studio Platinum 12 has about a dozen new feature additions over version 11 and each one is highly impactful. At the same time, like in version 11 and in the versions prior, Movie Studio Platinum remains an "open" application, meaning you can drag and drop various types of file formats onto the same timeline and then edit them without having to convert them all to one same format.
Such "openness" is one of the reasons why Sony Vegas and its off-shoot, Movie Studio, caught recognition in the previous several years. Another reason is that both work great on minimal system requirements, like on only a 2 GHz processor. A third reason is that both have quality audio tools right within them and you thus won't have to switch to other applications to work on the sound of your videos. (Although Sound Forge, which comes with this Suite, is a separate application, you may not need to jump to it for some of your smaller projects; but even when you do, the transition and collaboration will be seamless).