I'm a bit surprised that you'd put the C150 and C172 in the same category.
Fair enough, I was thinking more of their similarities in recovery than entry. Yes, the 172 is happily difficult to get in, as a four place general purpose aircraft should be.
For my experience, 150/152/172 all respond reasonably well to the "let go and wait" technique for spin recovery, where others I have spun will demand to be promptly and precisely recovered. I've only heard about other spin approved aircraft which demand a good recovery technique, I've not flown them....