I have had both on my bike. I like them both but the new Dynamic Sequential Turn Signal Model look like they came on the bike and appearance is fabulous.
I have the new Sequential's on the bike now.
The Switchback's look great and are very bright. We sell a lot of them, smoke lenses are more popular with the switchback's.
If you don't mind spending more get the sequential units. You can not use the turn signals in the pathfinder fog lights with the sequential turn signals.