The Roam has definitely a bigger and more readable screen.
I still can’t read text message notifications without glasses, but that’s because I’m an old fart.
I really like you can zoom in and out dynamically so if you really want large numbers, you can.
I have the first Karoo (ordered the 2 as well) and the screen is majestic, but the unit is really bulky.
I owned every single Garmin since the Edge 205 until the 520 and promised I’ll never ever give a single penny to that horrible company, they don’t deserve it.