Video of spin testing in the PA38 from 1979 here;
And a video of spin training in the PA38 from a school in the USA here;
Back in the 90's I was an instructor at a flying school in Sydney Australia that operated 2 C152s and 4 PA38s. By far the PA38's were the most popular, with larger or taller students and instructors appreciating the wider cabin of the PA38.
Most students would use the PA38 for their first few NAV's to save money, before moving onto the PA28 or C172. Hardly any students used the C152 for NAV's as they found it lacked the space for them to use a folder or kneeboard.
For me after spending 4 years flying the PA38 and the C152 I preferred the PA38, not only because of the extra space inside, but I found it produced a better pilot as it wasn't as docile as the C152.