Am I understand it correctly?
It’s better to get SSD> microD cards with readers > USB flash drives because usbs die faster after just a small number of loops which will happen due to the dash cam writing styles?
All 3 use flash memory. Same basic technology.
The more expensive versions of any use better quality/type of flash memory.
Just about all of them have some kind of wear-leveling at the controller level (meaning it writes to different parts of the flash as it goes)
What it essentially comes down to is the better the quality/type of memory, the more write cycles it's rated to handle.
If you use a tiny amount of storage this is a big deal- the 1 hour buffer uses 5.4 GB and each 10 minute saved recording is another 0.9 GB.
So let's say you have the camera "on" 10 hours a day (sentry for 8 at work, 2 hours driving between to/from work and if you run out someplace).
That's 54 GB recorded in 1 day. almost 7 full write cycles on an 8GB key. A "cheap" type of flash key will be rated for maybe 3000-5000 cycles. So that 8GB key is done in roughly 1-2 years.
But If you use a large enough one this won't make much difference- A 128GB key would only use about .43 write cycles in a day at that pace.... 157 write cycles per year... so rated at 3000-5000 write cycles means it's good for between 19 and 32 years.
Which seems plenty enough for me.
Now let's say you use dashcam and sentry 24/7. Worst case scenario.
So your use is 2.4 times higher than the above.
That 8GB cheap key is now dead in 5-10 months.
The 128GB key is still good for 8-13 years.
That's honestly plenty for me, so I just got the Samsung 128GB one I mentioned since it's really small, has good temp ratings, and called it a day.
I'd be more concerned about the rated conditions of whatever you buy- some SSDs for example explicitly list much narrow temp ranges for use than some USB sticks or SDcards so I'd easily pick either ahead of an SSD in that case.
By all means an SSD (if rated for the entire range of temps you will encounter) will work fine, but so should anything else of sufficient size that it's not burning through an entire write cycle in a week.
If you plan to keep the car for more than a decade and need recordings that old I guess you can pay more for MLC-based flash, which lasts about twice as many cycles as the cheap TLC stuff.... or drop a bundle on SLC which lasts 20 times longer than TLC I guess.
But if my biggest problem with a car after 8 years is my $25 USB key died I'll be pretty happy.