It really isn't a problem. Even wired ones don't get in the way as long as the hair is over them. My hair is almost down to my ass, and the first headphones I ever used in the shower were cheap skull candy ones that were wired Bluetooth. No issues at all hair wise. No issues at all tbh, other than sounding like crap because they were cheap skull candy buds.

"Better" is always situational as well. Better for one person in their situation can change in a different place or time. You get two different people in different places with different needs, and "Better" is so subjective as to be useless as a term.

As an example: quality of sound. The portable speaker is going to vary massively by price when it comes to being clear in sound once loud enough to counter the water noises. Even cheap ear buds don't have to go as loud to bypass water noise because they at least partly block the sound from reaching the ear in the first place. Which means the sound can be better, and less likely to be uncomfortable due to volume.

Neighbors in close quarters, housemates and timing, personal preferences regarding controlling playback, hearing acuity, etc. There's a ton of variables in what's going to be a desirable condition for enjoying music while bathing/showering. So, no, a portable speaker isn't inherently better. It's a choice for sure, but just because one person finds it preferable doesn't make it superior

Not every shower is a hair wash. Especially if you have long hair and shower daily it might be say a 1:4 ratio.
I advocate for headphones in those 75% of showers. Can be very nice.

I don't even have good speakers, so this ensures best sound quality. It also skips the setup steps, if you then proceed to commute to work say. Just a continuous music experience, and you'd have had to put them on later anyway.
Very fitting for the olde 5min shower out the door maneuver.