As a Sabre instructor, and someone who has been sprayed a dozen times in LE, I'll take Sabre 8 days a week....
Here's some interesting reading from Sabre about SHU's...the company VP David Nance is a chemist. I've spoken to him personally about this, and his explanation why Sabre is better is rock solid, imho.
NRA Certified Firearms Instructor
Utah Concealed Firearms Certified Instructor
SABRE Pepper Spray CSAP Instructor