There is no best. FoxPro makes the best quality caller, but their budget callers are pretty abysmal in sound quality and volume. Lucky Duck, Western Rivers, and even Icotec have sound libraries that put FoxPro to shame.

Lucky Duck makes budget call called the Rebel.... It has 12 preset sounds with no capability to change or add sounds..... But it uses a 10xAA speaker, and has the ability to play two sounds at once. It sounds amazing, and has crazy volume. The 12 sounds are Rick Paillet sounds, and are a very good base set of sounds. It also hs a very good built in decoy, and a crazy good remote range.