Similar to you, I'm working full time and I'm studying for the MCAT. This will be the third time I do the MCAT.
When I took it the first two times, I used Kaplan courses, and they were absolutely horrible. I would not recommend the Kaplan courses at all, because they are not practical and do not provide actual tips/tricks. Especially their methodology to CARS - don't listen to their way of summarizing the passages and whatnot. You do not have time for that. Their books are okay, but it feels like it was too much details.
I am currently studying on my own using The Berkeley Review content, and it's been great. I've been studying for about 4-ish months and I'm about 40% done with content. I'm looking for taking the MCAT in the fall 2021, because of my busy schedule and required time to study.
I think a huge portion of this decision will come down to your learning style. Do you need the class structure? Are you able to attend the classes? Some of those courses are pretty compressed - I'm not sure what your undergrad background is, but that will be something to consider. I have a Biology degree, but I forgot many things over the years. How long do you think you need to master the application of the material for MCAT?
Hope this helps!
Maikel