As for which potion i would personally pick...it would really depend on what my current mood was at the time.
Purple: I'm leaning towards this. I hate my job and I'd be content to live off of 3000 dollars of UBI as you could live nicely on that in most of "flyover" america.
Blue: If you asked me this 15-20 years ago I would have picked this for sure, no-brainer. But at my age there isn't as much I would gain, especially since +2 in looks would make me average at BEST, maybe a bit below
Yellow: This is the only one I'd never pick out of the four. I mean I'd take it over nothing, but I only included it since height is a big topic here.
Red: I have a low IQ and that comes with a lot of downsides without any positives. I'm limited to menial low wage unskilled labor, which obviously limits my earning potential. It's also very frustrating having a low IQ. I'm a slow learner, it's harder for me to understand things, I have trouble explaining things in real life (it's A LOT easier online when I have time to think). I "don't think on the fly" very well. +20 points would make me average, which would open up a lot of potential career paths. Though since I'm in my late 30s and only have unskilled low wage labor on my resume, that would be a big obstacle even if I magically woke up with an IQ of 100 or so. Like with the blue potion, I wouldn't have as much to gain from it as I would if I were 20 years younger.