Ace also offers a weight management certificate and a fitness nutrition certificate
ACE is also in the top 6 most commonly used organizations for personal trainer certification
https://www.acefitness.org/continuing-education/specialist-programs/weight-management/
I think the ACE certificates might be cheaper
But I think the NASM might have a higher level of academics though because they provide exercise physiology certifucates to people with bachelor degrees in specific fields and I think I have seen them cited as a source in Universities