COD 5 vs COD 4 DL maps

Soo i got both COD 4 and 5 i only have 800 mp to spend, what do u guys recommend me to do download the variaty map pack for COD 4 or w8 for COD 5 upcoming maps??

TY

Hmm i like the COD 4 multiplayer a bit more because the weapons are really cool and it doesnt got tanks. But they are almost the same. The good thing about the Cod 5 maps is that it adds a nazi zombie map which seems to be really fun because of the new things it adds. TY