Seems like a good browser. The only issue is how maintained will it be. Also, librewolf has been released and maintained properly and is proven time and time again. Not sure how different it is from LW.
If its an iPhone I would go with an iPhone plus for the screen size.
If its android, I would go with a Samsung A device. They’re usually big in size, affordable, comes with a lot of accessibility features, good battery, and relatively easy to find accessories and spare parts.