Good morning
Yeah all ways a quandary this one,
I always & ONLY use internally mounted Self made Thermal Privacy screen covers, Cheap & Easy to make yourself, Easy to Put Up & Down, Can peel back a corner if you hear something that warrants a peek outside easy enough, Can Also Use Just One of them as a Day Time Sun Screen/Blocker if required, & am more happy leaving INTERNAL Ones in place if I want to go off for a wander for the day to stop prying eyes.
I must say though, I saw one particular members External Cab covers last year on a few occasions & REALLY liked them as it not only covers the Windows, But coverd the whole Bonnet & Grill as well, & Although for me & my style of Living aboard they would be rarely used, I’m thinking when using a Longer term Park up of a few nights or so on a Site, Or At one of the ‘Private’ places I have permission to be for say a week they would be GREAT,,, Especially in the Winter Months.
So my answer is,,,,Concider Having BOTH !