Your monitor is a 20"
It might sound small, but a 20 inch 4:3 like the one I mention CAN be mount vertical (the superfast wide angle IPS panel), and in that position, the image of classic games is actually LARGER than on a 32 inch HDTV!
That 25 inch german-gay-ski-instructor-HeinzG 25 inch is as big as a 15 inch screen mount vertical when running classics (my fool name is in respect to the built quality of that brand)!
Even in HORIZONTAL position, the 20 inch 4:3 has the same image size as the 25 inch HeinzlG! Old games come in 4:3, so you have to compare at that aspect ratio. And since it is 1600x1200, instead of the HeinzG's 1440x1080 pixels for the 4:3 image, you have more pixels for nice tridot simulation, and vector sharpness.