DND_Reborn
The High Aldwin
I had considered given the ranger the Rover feature (or based on it). What are your thoughts on it?Not sure I agree with that. The ranger has spells, after all, which is a significant versatility advantage over rogue. Plus, the ranger has druid cantrips, which means their attack capabilities can be completely based of Wisdom. Grab shillelagh and produce flame, use a shield and a quarterstaff with dueling. Plus bonus damage if they're against their favored enemy. Polearm master and Hunter's Mark, Extra Attack 3 levels before Rogue; I think the Ranger will be fine.
That being said, I don't think we want to assume the min-max case; I would give the Ranger something useful for their bonus action just to avoid PAM shenanigans. Not sure what.
Rover
Your walking speed increases by 5 feet, and you gain a climbing speed and a swimming speed equal to your walking speed. In addition, you can use the Dash action as a bonus action on your turn.
The Canny feature from the UA was also considered:
Canny
Choose one skill: Animal Handling, Athletics, History, Insight, Investigation, Medicine, Nature, Perception, Stealth, or Survival. You gain proficiency in the chosen skill if you don’t already have it, and you can add double your proficiency bonus to ability checks using that skill.
In addition, thanks to your extensive wandering, you are able to speak, read, and write two languages of your choice.