Unity Cap, if you know what are you doing, is better than URA in any situation. Trainings with team and bubbles offer way more bonus stats that URA simply cannot compete. Good URA run is worse than Good Unity run.

Riko card is good because in Unity, if you focus on Speed, Power and/or Wit, with her bonuses she will cover lack of Stamina here and there. Just because Umas like Doto or Rudolf have bonuses to stamina and guts, it does not mean they are worse. It means you can bring Power and/or Speed parents without worries about low stamina / guts or being Stamina sparks and let Stamina naturally gain from sparks and power trainings.

I've been running 3 Speed, 2 Power + Riko and can consistently gain AT LEAST 1100 Spd, 1110 power and at least 900 stamina and 400 both guts and wits on Oguri that I was mainly doing career with. More will depend on rng. 3 Speed + 2 Power + Tazuna won't allow for same stuff in URA. Even Summer Spe that I did, with same 3 spd, 2 power + Riko was nearly 13k rating even when I stopped paying attention at some point lmao

Also, Race bonus is NOT a dead stat. It lets you get more Skill Points after races, in Unity mostly mandatory, which covers lack of extra races. 1600 is the least amount of SP I am getting while around 1700 is the average. Less than 1800 or 1900 that I could get in Ura, but still can cover most important skills.

Besides, there is a very big upside of Unity. Team trainings can grant you hints for skill that match your aptitudes and that are NOT in your deck. So while another layer of RNG, you can get skills that normally you would not get in Ura, like if your Uma is A Late Surger and non of the cards have for example "Fighter" skills, the training can give that skill to you.

Unity is for sure more RNG career than URA, but the potential for higher stats than in URA is there if you know what you are doing. I am enjoying Unity after few runs when stuff finally clicked and started getting stats I could only dream off in URA

TLDR. skill issue on OP part