Planet Bike Superflash has a very narrow beam and needs very careful aiming. On a straight road, that is what I like.
https://www.planetbike.com/superflash-bike-tail-light/
If I am on a winding up and down road, the Planet Bike Superflash 65 has a very wide beam and cars would see you at wider angles instead of straight behind.
https://www.planetbike.com/superflas...ke-tail-light/
I prefer AAA battery lights, but if you prefer USB charging lights then you won't want the above. I use rechargeable AAA batteries, but if I had to stop at a store to buy AAA disposables to ride somewhere, I could with AAA. I carry both of the above lights on bike tours. In fog or overcast I use both.