In my opinion its cscs. I say this because it is the most difficult to obtain, requires the most amount of knowledge to pass, which means the average joe can't hold such a certification. I have my ACE certification and all I did was read through the book and write a proctored online test...not very hard.
I saw MountainDog has cscs, which is pretty cool
The ACSM is the most prestigious and meaningful cert. Hands down.
You should really research what the companies in your area are looking for. I spent a lot of time finding the type of places I would like to work at and seeing which certs they wanted their trainers to have. I ended up getting certified by ACSM.
Yes NSCA! Very tough testing, reminds me of LSAT or something
This is the best in my area
The ACSM is the most prestigious and meaningful cert. Hands down.