I couldn't decide between Stingers and packs, but when I seen the stingers at almost $500, I went with Packs for $299. They were installed today and they sound awesome, I'm glad I went with packs.
Well the reason the Stingers are more is they are 100% stainless you get what you pay for so to speak Magnapacks are aluminized steel.
Plus stingers sound way better IMHO