There are some aesthetic differences which I think can be seen easily enough from pictures and probably don’t need to be described. Some poeple prefer the red accents of the 20T whereas others prefer the simple style and slightly thinner bezels of the 11T.
There are some differences in functionality in that only the XL2420T has the ‘S-Switch’ which makes using the OSD or switching between 3 different ‘custom’ presets very easy. It also has touch sensitive buttons which work quite nicely and are arranged a bit more logically than the pressable buttons on the 11T. Once you’ve set everything up though you don’t necessarily need to worry about the OSD too much.
The XL2420T has a broader selection of ports than the XL2411T. It features a DisplayPort input alongside DVI, VGA, 2 HDMI ports and 3 USB 2.0 ports. The XL2411T on the other hand features a single HDMI port, DVI and VGA. For most users they will just want to connect a PC using DVI and that will handle the monitor very well and isn’t a problem. Some users may find the additional ports helpful, particularly the DisplayPort if they are planning to use an unusual GPU (or gaming laptop perhaps) without DVI.
When it comes to the actual image performance the monitors are quite similar. The 11T seems to have been tweaked a bit, at least compared to the revision of the 20T we reviewed, but is essentially quite comparable when running the same settings. It seemed to give some slightly richer colours when running under ‘Standard mode’ and selecting ‘Gamma 4? without crushing shades or making colours far too deep as the 20T did.
The monitors are both very responsive but the 11T has a bit of an edge in that department. It actually runs at 144Hz natively, giving a slight edge in fluidity. It also offers ‘High’ and ‘Premium’ AMA (Advanced Motion Acceleration) modes rather than just ‘On’. The ‘High’ setting offers a more comfortable balance than the overly aggressive acceleration on the 20T and less conspicuous overdrive artifacts are produced as a result. Most users don’t seem to mind about these on the 20T anyway, but some do.
Those are really the key differences between the two monitors. It is really the S-Switch, extra ports and touch sensitive controls that add a bit of cost to the 20T (or at least are selling points that would allow BenQ to charge a premium). The 11T is newer though and has been tweaked a bit, particularly with its more flexible grey to grey acceleration options.
