For larger/growing companies with the funding to put into paid ads KlientBoost was great. Our original Account manager was wonderful and understood our initial goals. Connecting it to Salesforce was necessary for proper tracking. If you do not have someone who can also be dedicated to going over the results and making sure they are reporting correctly in your CRM you're in for a blind ride, though
I believe that Sequoia Consulting Group is a one-stop-shop solution for all things related to payroll, health insurance, and paid time off. Their interface is very easy to use and the app makes it easy to access all of this information. The one downside was that employee health insurance cards were entirely digital. I personally ran into a handful of issues with this when going to appointments. It would be nice to have a physical copy of the card upon request as well!
Pricing and turnkey options were why we went with Klient Boost. The fact that my team was only comprised of 3 people meant we needed more help on the implementation and execution of campaigns as we couldn't dedicate a single individual just for paid ads. With Klient Boost we got to adjust the copy and give insight into our goals but basically let them steer the ship, and they steered it well
I appreciate that Sequoia Consulting Group has a mobile app. Right now, neither Gusto nor Justworks have mobile apps which can be frustrating if you're not near your computer. I find their mobile app to be excellent and user-friendly. Conversely, I found Gusto's web app is the easiest to use compared to Sequoia's.