To those of you who ship reptiles, do you prefer Ship Your Reptiles or just FedEx and why? (I know SYR ships through FedEx.) Or do you go with some other company?

Also, does registering with SYR require any payment? And is it necessary to get certified when using SYR?

I am considering getting FedEx certified so I can ship a few snakes and baby geckos. I have read about the process but I'm also curious (and confused) about SYR. If anyone has words of wisdom that would be great.