Honestly, I like the 9.5. The only real problem is the discontinued parts. And, yes it's a little harder to work on. But, it's a small outboard, and as hard as it gets it's still not all that tough. There's only a couple discontinued parts, but they're prone to failure. If you can get one with an accompanying parts motor all the better.
Belive me I'd love toi drive and get it but i'm only 16 and have school and alot of other things I do. Is that the same style motor thats in your avatar?I'd take the 1957 10 hp and drive up to get it if you can. That way you save having it smashed during shipping and you get to pick the seller's brain. I bet he has lots of knowledge he's buying to share.
No, that's a 1953 Johnson QD-14 10 hp. Don't buy one like it. The carb is obsolete and a pain to work on.
Here is a 1957 10 hp.