As a (partially) laptop repairman and (partially, unproffessional) device engineer, I find hot air the most comfortable tool to work with, much more useful than soldering iron. Anything is easier to replace with hot air rather than soldering iron, from 0201 resistor to some TQFP-144 or larger BGA chips. But then again I work with SMD or BGA components a lot as well. You can replace anything smaller than laptop CPU or dGPU, which are simply too large for hot air station (and require training).
As for specifics, I STRONGLY DISCOURAGE you to buy anything under 200$. From my experience, they tend to overshoot the temperature a lot during turn on (to heat up quicker, I presume), and they hold the temperature poorly (can be as bad as 70C jumps while the temp is fixed, into the hotter area too!). Overheating can kill the chips, if you don't control the temperature.
If you want something universal for small and larger chips, I use Quick861DW, which is still on the affordable side, and it holds the temp really well, can handly about anything. Downside: it's a little louder than I would want to when I don't need it anymore and put it back onto the stand. I recommend to find some Youtube reviews where someone measures temp stability. 30C temp jumps are ok, more - not so much.
Overall, aim at 700W+ and you should be set for whatever life throws at you, phone or motherboard.