I would go with the Stainless Steel Prop. The rubber hub protects the gearbox, and the blades can handle quite an impact without damage. Pretty much do not have any need for a spare. If the hub breaks loose, you can still make it back at a lower power.
I have 34 years experience using SST props on 4 outboards and 2 I/O's, and have never damaged a lower unit, never damaged a blade, and only had one hub slip. Before that, my aluminum props would only last about 2 years in the debris filled lakes. My current SST prop has been in service for 19 years. I had it re-hubbed from OMC to volvo a year ago, and it is still in good condition.
Regarding "break-away hubs", as far as I know, ALL props with through-the-hub-exhaust have rubber hubs that will slip if over-stressed. Is this what you are reffering too?
Here is a nice
iboats thread on the topic:
http://forums.iboats.com/boat-topics-questions-not-engine-topics/break-away-hubs-34660.html
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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings