Best sway bar kit for 01 S

[RDS993]

Hello,

I'm researching sway bar kits & Have found the Eibach F&R to be a cost effective option.
The Eibach front is 24mm & the rear is 19mm. The stock S sway bar is 19mm?

Is it worth changing to the rear Eibach sway bar if it is the same size?
Are the Eibach stiffer?.

Also what drop link should I use?

Thanks Rich