@ gratefuljed

Must confess, I don't really understand your question. Why don't you want to use them? For more valor if you sell them? Both have their qualities and faults and both are more ... military use. I remember that Tommy Thompson was finding the 18 more appropriate than his 11 when Bo send it to him when he was in Vietnam. I will say, I will go with the one I feel the more easy with, without thinking in the futur. Both will keep their value. Personnally, I have a passion for the model 23 (single hilt) or the sergeant for all of my outdoors activities. For rabbit, salmons, pikes, I prefer smaller blades (the one I prefer by far is the model 7-4 1/2").
Talking about your kids, my first questions will be: How old are they? Is it their first knife? I will choose either a 5-5 either a 8. Both give a large possibilities and make the owner discover what he want/need with a knife.
The only "problem" with offering a randall is that you will also give them the randall virus .