I wish I knew of a product timeline, because I thought that Spycraft came out a whole year before d20 Modern. Though to be fair, "Action Dice/Points" came out in d20 Deadlands as Fate Chips first (unless you count Force Dice in Star Wars.)
For me, I like the higher power level of Spycraft. AEG has also been more open about offering tips on how to tweak classes as well, so between SG-1 and SC, you have a very comprhensive Modern/SF game on the cinematic side.
YMMV, though, for me, I have already bought SC, so I am invested in that direction. And anyone who want to tease me about that motivation has to put away their Forgotten Realms stuff first. LOL!
For me, I like the higher power level of Spycraft. AEG has also been more open about offering tips on how to tweak classes as well, so between SG-1 and SC, you have a very comprhensive Modern/SF game on the cinematic side.
YMMV, though, for me, I have already bought SC, so I am invested in that direction. And anyone who want to tease me about that motivation has to put away their Forgotten Realms stuff first. LOL!