either one will work
Aquarite is probably an older design and very well established. Lots of replacement parts out there for cells.
Pentair is newer design, has higher output options.
The thing that swings a lot of people is if they plan on installing it themselves. Some manufactures will honor a shorter warranty for DIY installs. But in the bigger picture either one will work. For other people the prospect of including automation will swing them. Have you seen this chart?
Compare and Review Saltwater Chlorine Generator Prices and Features
In the bigger picture either one will work.