At PCMag, we test hundreds of computers a year, some with touch screens, many without. Based on our in-labs testing and deep-dive reviews, we compiled the above matrix of the best touch-equipped machines that have passed through our hands. Below, let's run through the basics of laptop touch screens and why you might (or might not) want one.First of all, some terminology. In most cases, a touch-screen-equipped laptop has a conductive digitizing layer, overlaid on the panel element, that allows for tap, pinch, or swipe input. Most modern laptops make use of what's known as capacitive touch input, in which the over-screen layer detects where you've touched with one or more fingers using the conductivity of your skin. This layer is typically a grid of ultra-fine wires, or a film; it needs to be subtle or translucent enough to not interfere with viewability.

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That electrical aspect explains why touch screens don't work if you're wearing gloves. This is in contrast to the resistive touch technology you might see in other implementations of touch screens, in which the upper layer covering the screen flexes. When you write or tap on a resistive screen, that upper layer closes a circuit with another layer beneath it. (Having to press a little to, say, sign your name on a screen is an earmark of resistive touch.)Back to capacitive, though. The capacitive touch layer maps your finger or pen input to coordinates on the screen that determine the position of your touch. Also detected are parameters such as tap speed, whether you've tapped versus swiped, or if you've executed multi-finger touch. Note that tap pressure sensitivity is not a parameter that is typically detected through simple finger touch, though certain touch implementations and stylus pens might transmit that. More on those later.

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Mainstream and business clamshells. You'll see the most varied mix of touch and non-touch models here. This is the category most likely to be frought with touch versus non-touch models in the same system family. Take for example, the 1080p non-touch panel versus the 4K touch panel in the latest Dell XPS 13.2-in-1 convertibles and detachables. By their very nature, all 2-in-1 machines will have touch screens. When you're using a 360-degree-rotating 2-in-1 in tent or tablet mode, you don't have access to the keyboard, so touch input is essential in those modes. Likewise in a detachable 2-in-1: Remove the keyboard, and all you're left with for input is your tapping fingers or a stylus, Indeed, a key differentiator here is whether the 2-in-1 additionally supports stylus input, and if so, whether the stylus is included or costs extra. A high-profile example of the latter: the Microsoft Surface devices, which mandate $99 for the complement Surface Pen stylus.