First answer these questions.
What PPE do you need?
Daily wear or coveralls?
What climate?
Rent/lease or buy?
Laundering? Who will do it, who will ensure it is done right?
What HRC's are you exposed to? (Voltage has little to do with it)
Any chemical exposure? That determines your material choice.
How dirty will they get, industrial or home laundering?
Any clean room requirements?
Does Made in USA matter?
Does it need to be union made?
Does price matter or do you want the best regardless of price?
All these questions and more need to be considered to get the right PPE, there are about 20 different materials out there, all with advantages and disadvantages.
However, 90% of these guys selling the PPE have no idea about the performance of the materials or the other choices, they just sell what they buy, and usually that means Indura Ultra Soft, which is a good material for alot of people. Anyone can make coveralls or flash suits out of these fabrics (Indura is made in Chicago by Westex for example), the features and quality of the PPE you buy varies greatly from one place to the other so you better do your homework.