In general, I think projector TV would be quite an experience. It's fairly flexible too. You can adjust screen size depending on the size of the audience.
The sharpness of projector would depend on the resolution of the projector itself. Lumens is also a factor. The higher the better. Add to that the quality of projector screen.
Long term I think projector TVs are more expensive. The cost of the bulb is the biggest chunk. But what about accidentally dropping it while moving it around?