1440p ideally 120hz+
never buy a secondary monitor
buy a better one for you and your former main becomes the secondary
always grind my man
i have a 360hz 1440p oled i dont really feel like i need to upgrade this. i have the money to buy a better one but i dont really want to since my 2nd monitor is just gonna be for youtube / coding / emails / discord
Ah, so you got the upgrade-worthy monitor. To be fair, 60hz on the second monitor is probably fine anyways.
If you are from England look at KTC options, also AOC and LG have decent value for the money
sidenote: Never go VA or TN go IPS if you love your eyes
2nd monitor can be the most 30 dollar thrift shop shit you are not playing games on it anyways why do you need 120hz+
Just buy the best Samsung, ASUS, or LG monitor you can find with the specs you want. Though if you want to go cheaper aoc and asrock have some decent options.