I have never tried 888 or ACR and maybe it could be I am missing out on something but for me Pokerstars was my first choice when I started playing on-line Poker and for some reason I always seem to return to them.
Their professionalism when it come to running a site has to be second to none, and I always feel at home when I play on their site, even though it was banned in the States and I lost a lot of friends who I used to play against, I still prefer Pokerstars format.
I have tried many others and built small bankrolls from nothing but free-rolls, on a few but my game play changed from on-line playing to Live games, which I prefer, but as with all things good they sometimes come to an end, and because of the Covid Pandemic my live games are gone, perhaps forever as I am now getting to an age where I find no pleasure in spending a fortune on a night out, my beer is cheaper from the Supermarket's and taste's just as good, so it might be that on-line Poker is now my favorite pastime. Who knows?
When the fun Stops, STOP!