I like the Road Magnet because progressive Hyperco springs just don't turn in as well and the Road Magnet are similar drop and a bit stiffer especially the rear. Also the fact that Road Magnet has been broadly available for both platforms for probably like 5 years now and its significantly cheaper.
Hyperco; 290-300 front 190-200 rear (with the progressive first 0.5" of travel much softer but I forget that spec)
Rd. Mgnt;325 front 250 rear
The amount of drop for both springs is very close I think w/in 0.25" all around it depends if you have AC, battery relocate, turbo kit as well as NX vs SE-R
That being said I would totally buy a set of Hyperco because my wife and daughter will like it better. I won't pussy-foot around with this group buy until I have cash in hand though.
Plus Hyperco is so well regarded its almost like an investment. Its one of the few parts that make your B13 worth more imo. lol. Also like I posted I actually rode a set of them that I got my hands on bnib and sold them for more than I bought them for. Actually I traded my last set of Hyperco II for a Calum Basic, two tires, and $100 so it was a really good deal.