There seems to be a law that every criminal breaker has to be compared to Desperado. So let's do that. Desperado gives you a credit per successful run, becoming more valuable as you make more runs. Māui gives you, in effect, 1 per ice on HQ per turn, provided you run HQ at least one each turn. Māui becomes stronger as the corp's defense of HQ becomes harder to breach.
Desperado is 2 cheaper to install and adds one less . That probably doesn't matter much, but it factors in to the effective cost difference. I tend to consider 1 to be worth 1 on a console when comparing consoles.
For more casual players there's another difference: if you only have one core set you only have one Desperado whereas if you have any Māui you have a full set of them. So in terms of real world money Māui can be significantly cheaper to play with.
So which one is better? As all too often it depends. If you have a heavily HQ focused deck Māui can actually be the better console, strange as it may sound to those accustomed to the reign of Desperado. My reasoning is this: your average corp will against a criminal put 3 pieces of ice on HQ. That makes the maximum efficiency of Māui 3 per turn, assuming you run on HQ every turn and you use all three credits every time. Desperado makes as much money as you make successful runs each turn. Now I tend to suck at defending my servers and I've been visited by opponents a lot. But it's pretty rare for my opponents to make more than 2 runs per turn on average unless HQ or R&D has no ice in front of it. Hence I'm going to take 2 per turn as a best case average yield for Desperado.
Of course you won't run on HQ every turn, but if you run on HQ 2 out of 3 turns while HQ has 3 pieces of ice you're breaking even with best case Desperado. For a heavily HQ focused deck I think that hitting HQ less than 2 out of 3 turns is a red flag so I think that in such decks Māui should outperform Desperado.
If your deck doesn't have a laser focus on HQ though Desperado is probably more economical. It is in any case more flexible.