A pillow top mattress typically has an additional layer of padding on top of the mattress, which can provide a softer and more cushioned feel than a regular mattress. (A pillow top layer is simply a cosmetic difference and does not provide more or different comfort than a regular tight top mattress)
Some people find pillow top mattresses more comfortable, while others prefer the firmer feel of a regular mattress. (it's possible to make a very firm pillow top mattress, just as firm as a regular tight top mattress)
Ultimately, the feel of a pillow top mattress will depend on the specific materials and construction of the mattress, as well as individual preferences for firmness and support. (Unsure point the AI is trying to make here, the feel of any type of mattress, tight top, euro top, pillow top or smooth top always depends on the comfort layers placed between the cover and the coil)