But Which says Sony and Panasonic's largest LCD screen is only 46" not 50".
Only Panasonic makes a 50" which is Plasma.
Which?'s summary of two best brands :
Panasonic
Panasonic makes plasma and LCD TVs – but which are best?
Panasonic has had some great success in Which? tests in the past few years, but falls short of a 100% record thanks to some patchy performances of late.
However, its TVs are always easy to use, have plenty of versatile features and the best models deliver cutting-edge picture quality.
Most recent review of a Panasonic 50" Plasma was September 2009
Panasonic Viera TX-P50G10
Score 60% (Plasma) best price £968.95
Pros: Freesat tuner, natural picture detail and colour, reasonable audio performance, ethernet port
Cons: Irritating screen flicker, green tint, very high power consumption unless power-save setting is selected
Most recent review of Panasonic LCD was December 2008
Panasonic Viera TH-46PZ80
Score 52% best price £770.00
Panasonic TVs are normally easy to use, but this 46-inch high resolution plasma is some way off its usual high standard. On top of that, picture and sound quality are both below-par and energy efficiency is poor.
Pros: Easy to use, some useful features
Cons: Dull picture, high power consumption, poor sound quality, noisy internal fan
Sony
Sony TVs lead the way with green technology
Japanese LCD TV manufacturer Sony produces well-featured televisions, with lots of good eco selling points.
Sony was one of the first brands to include power-saving light sensor technology and radio screen blanking, and some of its latest TVs include presence sensors, which turn the picture off if nobody’s in the room
Most recent review of a Sony 46" was October 2009
Sony Bravia KDL-46Z5500
Score 73% best price £1,512.70
If you're after a high-end, big screen TV with all the latest extras, a classy finish and top-drawer picture, it's hard to go wrong with the Best Buy 46-inch full HD Z5500. Reasonably solid and detailed sound quality help give it the edge on much of the big-screen competition
Pros: Solid picture performance and plenty of features, ranging from the exotic to the functional. Sound quality is a cut above most rivals
Cons: Picture can fade from an angle, the current internet TV widgets are a little disappointing
Others
Samsung
Bestselling TV brand Samsung
As with LG, we've seen some significant signs of improvement from Samsung over the past two years.
Its position as the biggest-selling TV manufacturer in the UK has often felt more down to brilliant marketing and the chic, glossy black (and now much imitated) finish of most of its LCD and plasma TVs.
However, Samsung has been making waves with its LED TV ranges.
LG
LG strives to join the best TV league
Korean electronics giant LG has made some major improvements to its LCD and plasma TV ranges over the past two years.
Wrap up technical improvements in the lavishly designed glossy LCD and plasma panel beloved by the LG designers, and things are definitely looking up in terms of future success.
LG has also been at the forefront of pushing down the price of LCD and plasma TVs, with many of its entry-level models undercutting rival brands.
Along with the competitive price tags come a host of innovations including models with built in Freesat tuners, such as the 37LF7700 and new LED ranges including the 42SL9000.
Just like all the other LED TVs on the market these are, in reality, LCD TVs, with the traditional bulky backlights replaced by hundreds of light-emitting diodes.
Philips
Innovative Philips televisions challenge the best TVs
Philips has been a bit hit-and-miss with its TVs over the past couple of years – but has recently started to land a few more hits than misses.
Most notably, it’s been turning out some decent top-of-the-range large-screen LCD TVs – far better than what we’ve come to expect for LCD in anything over the 37-inch screen category.
Toshiba
Does Toshiba measure up in the battle for the best TV brand?
In the past couple of years, Toshiba has hit the headlines for all the wrong reasons.
In the battle of high-definition DVD formats (Blu-ray, backed primarily by Sony, versus HD-DVD, supported by Toshiba among others), Toshiba threw in the towel and Blu-ray won the day.
In response, Toshiba launched itself at the ‘how to make standard-definition TV look as good as high definition’ problem and came up with Resolution+ processing software.
Implemented on some of its DVD players and Regza LCD TV ranges, Toshiba claims that Resolution+ displays SD images at near high-definition quality.