Honestly ? right now Wilder's best fights have been Ortiz and Fury so far , maybe Molina , hell Washington gave him a good fight and was winning as long as it lasted maybe throw Stiverne 1 in there . It does not look good . Ortiz since then has proven to be over-hyped , his fight with Hammer proved that . Fury to be fair is not 100% and Fury embarrassed Wilder . Right now I think his fight with Breazeale is gonna be his most testing and trying and I got Breazeale for the upset , cannot wait to bet on it . If he fought Ruiz instead I'd probably go for the same thing a win for Ruiz . I think Wilder is in deep danger zone and is there for the taking . The fact that they now said no fight with AJ this year (yawn* so surprised) tells everyone a lot . Ruiz V Wilder would be either his 1st or 2nd fight probably .
He'd be the third best name on his CV. He's better than Washington, Molina and Stiverne but I'd expect Fury and Ortiz to beat him without too much effort. He'd have a good shot/be favourite to beat Breazeale too so he's already prob better than two of Joshua and Wilder's title defences.
At the moment it would be Wilders second best win after Ortiz but even if Ruiz loses to AJ Ruiz may prove himself in several fights after against the right opponents to be more successful than Ortiz.
Ruiz better then Stiverne but not as threatening as Ortiz for Wilder. Second best win as of now. His height really would make it difficult for him against a 6'7 opportunist . But Ruiz himself defeats the Stivernes and greats like Szpilka on Wilders resume.
I'd have him as his 3rd best win behind Ortiz and Stiverne from the first fight. Fury doesn't count as we all know Fury should of gotten the decision. I'd favour Ruiz Jr over Wilder's other title fights against Duhaupas, Washington, Szpilka, Molina and Arreola.