I use what's available to me:
BBBastard, Green Devil, Blaster Devil, Excel, Metal Tech/Airsoft Elite, Madbull.
Only ones I won't use are Firepower (bad experience with chopping/jams), any crappy Walmart/CT BB's, and Zero One "House brand" BB's (but moreso because of their business practises/ethics than anything, if they're offered to me I'll take them but I won't go out of my way to buy them).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE