You don't need either if you just want to hear what's on TV.
Playbar is a self-contained amp + speaker set designed for use as a TV sound bar. Plug in the mains cable, connect the optical cord to the TV, set it up to link to your home Wi-Fi and you're in business.
Connect Amp is for hooking up to Hi-Fi speakers or in-ceiling speakers.
A Connect is the amp-less version of a Connect Amp. It's for hooking in to an existing Hi-Fi where someone wants the Sonos features alongside their CD and vinyl etc.
All three products can be used independently, or if they're in the same house then they can be used as a multi-room music system.
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