Yeah, its Nightwing.
I think if their was an investigation and Nightwing and Robin were both competing to finish the mystery than Red Robin would win
In a Fight Nightwing
I just read a Red Robin comic where Tim said (paraphrasing slightly) “Fuck, I wish I had the agility and fighting prowess of Dick”
Well depends on what it is. I think Tim is the better hacker so he’d have that edge and depending on the situation he might .
However it’s canon Dick is the better fighter and the world’s 2nd best detective (but I think it’s said Tim has the potential to surpass him in the latter category so who knows on that in the future).
If it’s a hand to hand fight Nightwing’s going to win no doubt. He just has the experience, better fitness, fighter ability and typically better read on people.
Nightwing would destroy Red Robin easily if there was no holding back. Tim is the softest Robin of the bunch.
Nightwing is the better fighter.