Pretty much the only one i'm still happy with is crunchyroll. They don't fuck around despite being basically the only game in town.
Netflix I pay for begrudgingly but if they raise the price substantially or add mandatory ads EVER they are gonna be gone. I'm already pissed they are axing Kaos, like so many other good shows before it.
Already axed prime last year due to them adding ads, I don't even miss the expedited delivery because all the big box stores deliver for free, some even same day, at equivalent prices.
Disney recently boned me out of account sharing, so my plex server is getting pimped out. $1000 buy gets you substantial NAS storage for 6-7 years. That's ~$14/mo if you replace nothing for 6 years. By the time drives start dying the sizes double and you can expand your raid as they die off one by one.
Anywho, Plex servers (and other FOSS alternatives now) usually have no problems transcoding and serving multiple 1080p and 4k streams concurrently. Plus you can download media for offline play within the respective server's app on all kinds of devices, and for plex the server owner doesn't need to license guests. That being said, non-plex options are what i'd go with because they are as good or better without any license cost. I just use plex because I bought a lifetime sub before the alternatives were mature. It's nice having a library that only grows, never shrinks. No temporary licenses or content runs so I can have a massive backlog and not worry if I don't get around to it for years. Just a lot of wins, no downsides that I know of.