Quoting: Saskleaf
Probably none, but you can try (I'm guessing by your user flair "watches no games" that you're a big analytical guy).
Yeah It's mostly gonna be extractions of stats showing how, while he does increase offense going forward, Rielly increases offense going his teams direction even more. He was really good in 16-18, then he was basically current Darnell Nurse for two seasons (like a fine offensively minded mid-pair guy), and then pretty damn bad last year.
Whitecloud had an amazing 19-20, like better than any of Rielly's seasons by far. *But* he did have a weaker last year now that I look, and considering the sample maybe he's not currently much better than Morgan.
However, after Rielly lost some offensive touch last season, he's not particularly good at anything. Whitecloud is still a defensively skilled player. I would probably lean Rielly 5on5 currently though, while Whitecloud is a much better specialist.
With time on his side, I do believe that Whitecloud could have some of the better defensive seasons in the league over the next few years. I think Rielly's prime is past him, and he not only needs to come back to offensive form, but do something he's never really done and play defense to be worth his contract.
So, yeah, maybe I was quick on the trigger - Rielly might be just a tad better as of now, but anything beyond this season and I would lean towards Whitecloud, and that's before even considering the money. Meaning I'd rather take him than Rielly for the exact same cap hit and length.