A ha a bit of comparative analysis! It's pretty much what I do as a job and I am an unashamed nerdette when it comes to this so I will take advantage of my skills ha ha.
The comparison however has not been made easy as you have picked arguably two out of the three most beautiful girls on LP,but maybe that was the point?! Which of course by default makes them two of the most beautiful women on the planet:)
Starting with looks it's a very close call if I am honest but to try and be uber analytical I will start with their faces. Both girls have classic Slavic faces, strong defined features and great cheekbones. They have the facial type that just send me into a certain place, I am a sucker for that classic slavic look and they both deliver. Both have really nice eyes also, warm and inviting though for me Rias are a little more doey and therefore appealing. Both girls have strong kissable lips with Rias again being the more prominent of the two. On balance I would say facially Ria is the prettier but only just, I guess I find her face that bit more captivating.
Moving onto their bodies I find this difficult to pick also. Not sure that Ria has 'puppy fat' as from what I can see she is very hard bodied and lean. I prefer small tits so usually Ria would win on those but in this instance I prefer Belle's. What woman wouldn't want boobs like hers? They are glorious and weightless and so full and pert. I agree with what Magizi said about Rias ass, it's nice alright but hasn't the same hang or pertness as Belles, however the flatness will likely fill out in a year or so.
Both girls have stonking legs, I prefer Rias tone and shape a bit more if I am honest although Belle's are longer. In the pussy department then Its an easy win for Belle imho. I have a fetish for large labia and Belles lips are mighty suckable and large so if it was out of the two for a bit of oral, Belle would be my choice.
Overall I prefer Belle's figure plus she has literally zero bad fat, just look at her and you will see what I mean!
Performance wise it's a no brainer for me with Belle the superior of the two, she is amazing and just screams sex. Ria is still a little shy but in an endearing way and possibly lacks the self confidence of the older girl. Bare in mind that Belle speaks fluent English which may explain her ease on front of the camera. Given time I think Ria will get better once she has the experience Belle has. As I remember Belle wasn't the final word in performance in her early scenes but recently she seems like.anything is possible!! I really value seeing technique in other women and Belle has great technique.
So,overall I would pick Belle. Just. Regards their daps I would need to rewatch their scenes again but assuming the criteria is their ease of doing it and how well their asses open to two dicks then I am confident Belle is the more accomplished of the two.
As amazing both girls are there are still one or two I rate more.highly but not on looks necessarily, just the overall package.
Great thread btw and I'd welcome more analysis like this, as thoroughly semantic as they are
ps I wrote this on tbe train, covering my phone from peering eyes so apologies for any typos, still it killed half an hour lol
Xx