All of them are good choices but as for my opinion I would say cap would be a better choice just because he is usable in 2 abx days. Among qs and ws, qs shines better in pvp and pve than ws with his new uni. He can wbu Corvus and proxima, while cap only shines in proxima. Here, qs becomes a better choice.
So, final choice would be urs, cap if u want high abx scores or qs if u want high wbu stages.