FreeSync (VESA standard adaptive sync) adds $0 to $25 to the price of an otherwise-similar monitor that lacks variable refresh rate. Variable refresh rate makes gaming better and FreeSync is (very nearly) free. After gouging their customers mercilessly for more than five years with expensive proprietary G-Sync, NVidia has just recently stopped blocking VESA standard adaptive sync in their drivers (for GeForce GTX10?0 and RTX20?0 graphics cards). What's not to love about FreeSync?
With an existing 60 Hz IPS LCD display, you should probably hold off to upgrade to a monitor that has 120+ Hz and FreeSync variable refresh. An IPS/PLS/AHVA or VA/PVA/MVA LCD panel would best match the image quality of your current monitor. TN LCD panels are cheap and fast where color accuracy and viewing angle do not matter. If you use your PC for significant editing or viewing of video or photos, you probably would not want a TN LCD panel. If you use your PC just for gaming, then TN LCD panels can offer the fastest pixel response rate (though input lag from the monitor's electronics can become more significant than the LCD panel's response time).
Not all FreeSync is equal. For seamless low framerate compensation (LFC) when your graphics card's performance drops below the minimum FreeSync frequency, the card can automatically double the refresh rate so that each frame that the graphics card renders is sent to the monitor twice. That means that we would like to have a FreeSync range where the lower frequency is less than half of the upper frequency. 48-120 Hz is good because LFC will automatically extend FreeSync operation below 48 Hz. A FreeSync range of 48-75 Hz is less good not only because it cannot do more than 75 Hz but also because it doesn't allow FreeSync below 48 Hz. Without LFC, you may need to do some tuning of the game's graphics options to keep your performance above the minimum of the FreeSync range. With LFC, you can still have smooth and tear-free gaming when frame rates are below the lower FreeSync frequency. Some folks have succeeded in extending the default variable refresh frequency range of their monitors by customizing driver capability settings, but if you want something that works well out of the box, look for a monitor with a broader FreeSync range. Any monitor with AMD's "FreeSync 2" certification is guaranteed to support LFC.
I don't know about PC hardware availability and pricing in Brazil, but most monitors are built in Asia and are then shipped all over the world.
i7-9700K, H100i v2, Z390M Pro4, 32 GiB, RX Vega64, Define Mini-C, SSR-850PX, C32HG70, RK-9000BR, MX518