I don't know but that question implies you are building your own speaker...
There's probably no answer without defining "best"? Smooth frequency response? Dispersion? Low distortion? High sensitivity-efficiency? High output and/or high power handling? Best bass in a small box? Best performance in a sealed box? Deep bass and/or strong bass? Etc.?
If you want the "best" without regard to price it's probably better to buy a complete speaker that's been fully-tested and tweaked for the best performance, without concerning yourself with what components were used.
There are usually LOTs of trade-offs, including cost. (Manufacturer's usually tout their material decisions and design choices as advantages, but there are always trade-offs and it's usually just marketing.)