If you’re going to use the Unreal editor, then the more power, the better.
If you’re a one man band, then you probably won’t be working on the size of levels that need the Quadro level of VRAM budget. Probably.
If your computer can fit it, and your power supply can handle it, and your budget can handle it, and you have enough main RAM (because you need > 3x as much main RAM as VRAM) then the RTX 4090 is the choice.
If your system could stand an M.2 disk SSD upgrade, and maybe doubling the RAM, spending that money there and getting the next level down of GPU might be the best overall choice.
And then just back down until the price/power/RAM fits your budget 
The RTX 4060 is fine, as far as those things go. Just don’t go below that.