I practice stalls regularly so don't find them scary because I have a pretty good idea of what's likely to happen. On the other hand you seem to have had a good go at spins, which I haven't, so they would be disorienting for me until I'd had enough practice to feel confident I could recover safely. Really, the scary stalls or spins are the ones that may happen when you don't expect them, and when you may be in a situation where the outcome won't be good. Luckily, so far that hasn't happened to me.