For my own collection, I would go for the Mini Rukus, because the ability to change the scales interests me, and my Resistor already fills the function that the 14205 would for me. Those silver G10 and rosewood scales make the Rukus/Mini Rukus a really tempting one to purchase...
With that said, my general recommendation would be in favor of the 14205. A main reason for this is that the 14205 has great ergos that allow for really any grip. So whether you like to hold the knife like the designer anticipates, or if you like to choke up on the blade more often, or scoot further down the handle, whatever, the 14205 is great, because it allows for all of that, and feels quite comfortable in any of those grips. The Mini Rukus, however, has felt to me like it locks your hand in a single grip. Granted, it's really comfortable in that grip, but when I handled it, my hand kept itching for other ways to grip the knife; maybe we could call that hand-claustrophobia?
Anyway, in addition to the ergos, the 14205 will be a lot easier to fit in your pocket unobtrusively, in my opinion. I also feel like the clip of the Mini Rukus is a bit more unstable than that of the 14205. This may not be a real, functional difference, but it can make the knife "feel" less stable.
As for the blades of the two knives, the profile is one of my favorites. I think the Mini Rukus might cut more efficiently, since it's a thinner blade, but for my purposes, I feel like the finger guard may hinder some cutting tasks, particularly in the kitchen. And between S30V and 154CM, they're both pretty nice stuff coming from BM. I suppose I've noticed 154CM to hold it's edge maybe slightly longer than 154CM, but really the difference isn't huge. In fact, the bigger difference between the two from my experience is that 154CM is noticeably easier to sharpen.
Ultimately, though, it's a win-win situation. You'll like the knife no matter which one you choose. But, you know, if you decide you don't like it for whatever reason, let me know, and I'd be happy to provide you with the shipping address of a place where it'll be well-appreciated...