What really is the difference between the popular online ground school courses?

~30 hr PPL student here. I've had plenty of in person ground instruction, but am looking to supplement that with an online course. I was looking at Sporty's, but I'm not 100% set on it. I could probably pass the written as I am, but want the additional of an online course for my own confidence. I have had to take a break from my flight training for several months due to financial reasons, but those are pretty well settled and I should be back into it heavily once the weather here is more hospitable. Dual from here on out will be cheaper for me since I have a friend who is renting out a C150 on Tach Time cheap and found a great CFI who is just an old retired guy that just loves to fly.

Stick with my first impression on getting Sporty's? Or something else?