macbook 2014

I have used Open Core legacy patcher with all versions of macOS, with little to no problems (except a bit more laggy than Catalina, which was amazing). But now, with Sonoma, it hangs/freezes occationally (2-4 times a week). Sometimes for a 1-3 minutes, other times I have to shutdown. Last time...

I currently have a MacBook Pro (Retina, 13-inch, Mid 2014) and need a monitor. I found these Dell ones but am confused as to whether the scaling would ruin the display? I have no knowledge related to monitors so would appreciate any advice. I'm likely to update my MacBook in the next few years...