Revan wins, obviously. Cronal is smart and cunning, and he has Darksight, granted. However, warfare is completely different from political machinations. Cronal has one showing of genuine tactical skill in war, just one. Revan has masterminded two wars, one of which he won completely and utterly against a vastly superior military force, the other he would have won if not for the betrayal of his apprentice.
Let's keep in mind Revan's accomplishments during the Mandalorian Wars. Not only had the Mandalorians broken into the Core Worlds, but the Republic was on the verge of collapse by that point:
The Mandalorians reach the Core Worlds at Duro. The Republic is on the verge of collapse.
--The Essential Atlas
Despite this, Revan and his Jedi defeated the Mandalorians in but a year (Revan joined in 3961 and the war ended in 3960). Revan didn't just defeat them, though, he utterly crushed them. Almost all of Mandalore the Ultimate's gains were rolled back by Revan's forces:
Revan rolled back almost all of Mandalore the Ultimate's gains, retaking Taris and wiping out the Mandalorian ground forces at Althir.
--The Essential Atlas
From there, Revan drew the Mandalorians into a trap at Malachor V and utterly annihilated them to the point that the Mandalorians could never pose a galactic threat again.
Now, what about Cronal?
Yes, Cronal waged his own war, this time against the New Republic. He was rather successful of course. However, take note that the galaxy was in chaos during this time. The New Republic was still fighting the Galactic Civil War, making engagements with other Imperial forces (such as the Warlord Zsinj), Ssi-ruuk, Lumiya and the Nagai, as well as its continuing campaigns into the Core World. (Review the Essential Atlas, the Essential Guide to Warfare, or even Wookieepedia to confirm)
Essentially, Cronal engaged a distracted New Republic. It should be obvious that he did so well. In comparison, Revan took a broken Republic and met the Mandalorians head on, utterly crushing them while simultaneously working to corrupt his own forces.
But Cronal set up that trap, right? One of his better accomplishments? Yes he did, and yes it is. Thing is, it didn't work. If we're still comparing Revan's feats in the Mandalorian Wars to Cronal's, then Revan has him beat in the development of traps. Mostly because his trap was actually successful. Even better, Revan wasn't even there for most of the battle at Malachor V. Revan's trap was so well-founded that he didn't even need to execute it personally until the final stages. On the flip side, Cronal was at Mindor and he still lost.
I would refer to Rishi for another example of Revan's skill in that particular area, but it seems to have already been mentioned, so I don't feel a pressing need to get into it.
Revan is the superior tactician, obviously. I think we can all agree to that, right? Moving on...
So, what about Darksight? Well, as a perceptive ability it is incredibly powerful. However, it has one major flaw. As has been posted already, Darksight drives Cronal slowly insane. If Cronal were to rely on this ability since he is so outclassed in tactical abilities, he would slowly drive himself towards insanity. Psychological warfare (one of Revan's most used methods) becomes that much more effective. Revan's mass deceptions skyrocket in efficiency. Etc, etc. Revan's advanced military tactics are practically designed to take advantage of Cronal's slowly growing insanity and paranoia.
And not to mention Revan's own advanced perceptive abilities. Revan can see the paths of entire wars and outdo other masters of precognitive abilities, as he demonstrated during the engagements with the Echani's greatest warrior Yusanis.
So, assuming Cronal uses Darksight and sees himself winning against Revan, the latter will most likely be able to predict Cronal's movements and counter them. It's simple, Cronal sees the outcome and attempts to manipulate events towards that outcome. Revan sees these events and counters.
Regardless, Revan is the superior military commander and has a means of contending with Cronal's Darksight, flawed as it is. Based on all of the above and more, Revan should come out on top.