Best answer by Chris
If it is going to primarily be TV with a little music listening mixed in then Playbar all the way.
If your wanting to listen to a lot of music in the room with the benefit of boosting TV sound at times when want - then the Play:5. There will be a about 70ms delay of the TV audio using the Play:5 - whether that is noticeable is up to you (I don't find noticeable unless leave TV speakers on and then there is echo).
The Playbar is a pretty recent speaker and internally as far as the wireless etc. I think the Playbar isn't too far removed from the internals of the Play:5 so I wouldn't worry about longevity.