Yeah, they're all pretty disappointing. I'd love to have something that feels like how movies portray digital assistants. Movie assistants never misunderstand you or say "I'm sorry, I couldn't recognize your voice". I've mostly used the Google one and it's so bad at doing what I feel like is feasible even with inaccuracy.

Eg, I've tried to tell my assistant to like a song that was currently playing on YTM but could not find a voice command that worked (and some commands backfired by making it skip to the next song). I've had very poor success with getting assistant to cast something to my Chromecast with my voice. It sometimes works, but it fails or gets it wrong so often that it's not worth the time.

Sometimes I use it for rewinding (e.g., "ok google, rewind 30 seconds") because many apps don't have granular rewind buttons and tracking on the track bar is way too inaccurate. But lol, it's so slow! It takes a few seconds to figure out what I said (so I have to ask it to rewind more than I wish) and it seems every app is unoptimized for rewinding, as it usually takes several seconds of loading.

It can't really do any kind of research either. You basically can just ask it to google things and it sometimes is able to extract the meaningful part from simple questions. It's a far way from how Hollywood thinks a digital assistant will work.