Battery is definitely better than air. I only have air and it drives me spare. Pardon the pun.
Worth having a look at these
http://www.homedepot.com/b/Tools-Hardware-Air-Compressors-Tools-Accessories-Nail-Guns-Pneumatic-Staple-Guns/Ryobi/Cordless-Electric/N-5yc1vZc2cdZ1awZ1z0ri8a
http://www.homedepot.com/b/Tools-Hardware-Power-Tools/Ryobi/N-5yc1vZc298Z1aw?Nao=72&Ns=P_REP_PRC_MODE|0