What screen size should I pick: 5, 6, 7, or 8 inches?

Reviewer consensus is that 5-inch (Drive 52/53) is best for compact cars and tight dashboards, 6-inch (DriveSmart 66, dezl OTR610/620) is the most popular sweet spot, and 7-to-8-inch units (DriveSmart 76/86) are favored by drivers who want highway-sign-style lane guidance but need to verify the unit won't block too much windshield. Specialist Garmin subreddit posts note the 66/76/86 share nearly identical software, so size and price are the main differentiators.