3 die set vs 2 die set

I'm new to reloading and am beginning to reload 338 WBY RPM.

what's the difference between these two sets?

Lee Precision Pacesetter Set vs RCBS Full Length Die Set

https://leeprecision.com/very-ltd-pacesetter-338-weatherby-rpm

https://shop.rcbs.com/full-length-die-set-group-d-bottleneck-rifle-cartridges/