If the arms claim to give more adjustability to caster or camber, they could be a benefit.
However, some manufactures may state, that uppers and lowers have to be used together for the added adjustability, or maybe the benefit is in an entire kit that has to work together.
I would NOT just change out uppers and leave everything stock, as there'd be no performance advantage, and only a 50% visual change
If the truck is between a stock and 2" drop in the front the added caster or camber adjustments would probably be a moot point unless you're doing it for some specific racing class, or as pointed out above, you want to deep dive the stock settings for a more modern feel.
This is only your first post it looks like, so welcome!
If you want, let us know more about what you are working on, and what your goals are for the truck. The more these members know, the more helpful they can be.