Unless the older knife has a makers mark (stamp) or you know who made it, the time period and it's value, I would recommend the Case XX and probably the Buck 119! While the Buck 105 is slightly more valuable than the 119, you can do so much more with the 119 and also the mere size of it, scares the shiite out of would be attackers, LOL. However, I am also a little biased as I was gifted a Buck 119 many years ago and I carry it all the time. The Case XX should be a no brainer due to it's value and potential increase in value!
Frank