Both are good - with their own pro’s and con’s
Laptops can be used for auditioning tracks or practicing sets, more or less anywhere, whereas you wouldn’t necessarily pop into Starbucks with an SC5000 and an X1800 for a quick jam over a Latte.
However, laptop screen size isn’t a clear cut advantage either. A lot of DJ software “looses” half the normal screen by offering duplication of a hardware player, so the difference between how much library is visible on a laptop screen compared to a dedicated DJ hardware screen isn’t straightforward. With great search options and filters, both laptops or standalone units would offer you clear results to any search.
I think that the comparisons which are being mentioned (Ferrari Vs Playstation driving game, Einstein serving peanuts, buying a Porsche but only driving it at 25 mph etc, all relate to the never-before-seen amount of processing power that’s inside the SC5000 Prime.
All of that processing power is needed for such a powerful standalone experience, whereas all that would be needed for a box that can send MIDI signals to a laptop, would be little more than a $40 keyboard.
Such comparisons however, don’t take into account that some DJs may want to use the SC5000 primarily Standalone, but drop to using it for laptop control for background music, or if their USB stick in the SC5000 was to fail etc. Similarly, the DJ who uses laptop for some parts of the gig, but would use standalone if/when the laptop suffers crash etc.