Back to @Kenny-1 's original question:
I am using a Weuaste 5 inch AA /CP device - the one without cameras and that comes with a RAM mount. It's inexpensive (currently $140 on Amazon US), and I look at it as R&D -- a cheap way to get familiar with the tech and see if it will work for me. It was a little tricky to get bluetooth working with both my Cardo communicator and the AA unit, but I figured it out. (If you go with this unit, let me know and I can provide you with a software update that took care of the issue.)
If I decide to stay with AA, I may eventually upgrade to a 7 inch unit. One advantage of AA / CP units is that you can have two programs on the display at once, e.g., MRA and Spotify, or even MRA and Google Maps, which is great if you're travelling through unknown areas. It's a bit busy doing this on a 5" unit, though, so I currently run only MRA. Would likely work better on a 7 inch screen. But I also don't want to have a big device on the bars in front of me, and I like the 5" for that.
The screen on the Weuaste is 1,000 nits, which I find is the minimum for visibility in the sun when I am wearing sunglasses. I also have a Doogee rugged Android phone (S41pro) which I tried, but the screen is only 500 nits (which is also true of the Doogee S200 that @Ralph-Janssen mentioned). 500 nits isn't bright enough for me. It's okay on a cloudy day, but not when it's sunny. (Also, I don't think the S41 has enough processing power - I get error messages when I try to use it with the Weuaste AA, but I haven't cared enough to try to figure that out.)
My last big trip to unknown territory was last spring to the South of France (I live in the US near Washington, DC). I used my Google Pixel 6. It was okay, but I had problems related to it being a phone. e.g., issues with raindrops, with the phone getting too hot, etc. And it was a PITA when I wanted to take it off the bars to take a picture. I'm experimenting with AA auto because the devices are specifically designed to work on motorcycles in the rain. But I went with a cheap unit because I'm not convinced yet that AA will be the ultimate solution. BTW, MRA seems to work reasonably well with it now. Although the MRA screen presented by AA is somewhat different than on a phone, and the zooming isn't quite as good, that hasn't been a deal-breaker for me so far. Not for a $130 unit.
The other option out there is a Zumo XT, but the thread just after this one showed why I want to avoid that. Very expensive unit (although a beautiful display) but a really difficult learning curve with even experienced users needing weird and complicated work-arounds to make it function with MRA..
Lots of different opinions about all of this, and that's great -- hope my few thoughts are helpful.
Vinnie