Sony KDL-40XBR6: What’s better for gaming a tv or a Monitor

DisplayLag lists tested input lag for various TVs and monitors.

For reference, I game on a Sony KDL-55HX850. It has an "Okay" rating and I have no problems with it.

Plenty of monitors have input lag, so this isn't a TV exclusive problem. The explanation for the Plasma TV numbers being higher is enlightening (whole screen refresh vs line by line updating on an LCD). My own TV is a Sony KDL-55HX850 (55HX853 in Europe).
28ms of input lag is tolerable.

It seems to be my TV Sony KDL-4025500, tried another and its fine.

i love my good old Panasonic LZD800F.

Way better than my Sony KDL 46 EX 728 or my small 32" Philips. The Pana is my oldest TV but still the best for gaming. Great colors and no so called "Input Lag"

Seriously wrong there, too:
www.televisioninfo.com/.../Vs-Sony-KDL-55EX720.htm

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And that's reviewing a midrange Sony.

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"Sony had the advantage with color and motion performance, as well as a slightly higher contrast."

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"The Panasonic TC-P50ST30 was very close to the outstanding contrast ratio of the Sony KDL-55EX720, but each excelled in a different way. The Panasonic, as a plasma, had a far deeper black. The Sony's black level was good, but its peak brightness was much
better."

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"The Sony KDL-55EX720 came out the winner in the contest for best color, offering a steadier color temperature and better, smoother RGB color curves."

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"The Panasonic TC-P50ST30 has some big problems with motion artifacting, which cost it a lot of points. The Sony KDL-55EX720 was far better in this regard." Motion scores were nearly twice the Panasonic.

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So nowhere near the overall performance advantages some would claim. Viewing angles and 3D performance fall squarely in the plasma's field, but I have said that before.