First thing first, Kuzan does not have Prime Garp Level strength. We know some time passes, as Garp states various instances of his life, like Dragon or Luffy. If Anything Kuzan matched a 65-70ish Garp level strength, which is already good but slightly out of prime.
Second, I didn't like these two chapters, they were sloppy, rushed and didn't do any justice to neither the Ex-Admiral nor Garp, unless we know both sandbagged on purpose due to Garp knowing Kuzan's motivation, I think Oda should handled this better.
About Garp vs Kuzan, without any hypothetical outcomes or imaginative scenarios like Admiral's awakening and being unbiased, Garp looked overall superior. There a lot of considerable facts to consider since we don't have the full summary and more could happen.
But, from what 1087 showed and the little we have from 1088, it's what it looks like. I dislike the fact that Kuzan used those fodders, if I blame Shiryu from using underhanded methods, I can't favor Kuzan because he's an Admiral and I'm an Admiral Fan.
If we consider Awakening, and depending on both Kuzan and Garp are in this chapter and get new insight, my opinion can change.