Model #5's can be ordered with a top bevel sharpened and a Model "C" styled sheath. The nickel silver butt cap on your model #5 will prove to make the butt end heavier than you probably feel comfortable with.
Not choosing one over another: Just pointing out some observations. Your #15, "CDT" has "no butt cap". Naturally the difference between the two will be huge. While it is fair to make comparisons of 2 Randall knives with like options, it is also impossible to equate any "feel' or "balance" comparisons on these 2. I do think that they are both great looking examples...just a lot different.
Best, Capt. Chris
PS: Here's 3 of my "CDT's"...CCS