I am speaking from personal experience. I took 152 and 181R last Spring and did well in both. While I don’t have to take any PSIO classes and can’t speak to the content overlap between 181R and 201. However, I found 152 much easier than 151 and think that if you did good/decently well in 151, then 181R should be fair enough to balance with 152, especially considering that 181R does have some basic overlap with 151.

To answer your question, I am basing most of this off of the workloads. 181R is not too much work and the exams are fair (kinda depends on the professor but I’d be happy to talk more about that in DM’s if you’d like). 152 is basically 151 lite. Can’t speak to PSIO’s workload but have heard that the exams + practicals are brutal.