We speak from experience here. Sure, it’s nice gaming on a 32” or even 43” monitor in 4K, but to take full advantage of those you need a PC that will echo through your wallet for a long, long time. You also need to prepare enough desktop space, and we don’t mean Windows. We mean a literally big desk with enough room for a massive screen.
That’s one hassle you save yourself if you choose a 25” or 27” gaming monitor. And as for the cost, by going with 1080p you get access to full 144Hz 1ms MPRT gaming at a fraction of the price of a 4K 60Hz setup. That’s just physical reality and simple economics.
So, between practical considerations like spending and speed, and visual evaluations regarding what’s necessary to show a full 1080p image without diluting it or compressing the screen, we once more conclude the best sizes for a full HD gaming monitor are either 25” or 27”. Which one you choose is up to you, there’s not that big of a difference. We’d say go with 27” if you can, typically the price differential isn’t much, as full HD monitors as a whole are very affordable these days.
And don’t worry, you’re not being left behind or anything. Whenever you can and when technology matures to the point of making 4K the true high-speed gaming standard, you can always upgrade. Enjoy!