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There's always a balance and trade-off here.
2x scaling with 4k really means you end up with the same screen real estate as 1080p.
In my opinion I would very much prefer 24" or 25" at 1440p with native scaling which is ~120 PPI. I personally run both a 25" 1440p display and another 24" 1440p display at 1x. I still consider going from 1080p to 1440p one of the biggest quality of life upgrades I've encountered when I made the switch 7 years ago. It's the same level of "wow this is great" as going from a HDD to SSD.
Before there were shortages you could get a high quality IPS panel monitor from a reputable brand (Dell, ViewSonic) with low input latency for around $300. 4k at 1.5x also gives you the same real estate as 1440p but with higher PPI but I don't know how crisp that will be given the scaling ratio.