Pretty sure 10Cr is more akin to 440C than 9Cr is. 9Cr is a good steel, but it doesn't have the same carbon content that 10Cr or 440C have. I've had knives in all 3 steels, and I'd say a good 440C is marginally better at edge retention than 10Cr, but that could have been HT variance, but both are a little bit better than 9Cr. For toughness, 10Cr might be a hair tougher than 440C, but less tough than 9Cr and 8Cr, but the corrosion resistance is the opposite with 440C at the top and 8Cr at the bottom.
Hope that at least comes across as semi decipherable.