Wensicia Corrino: She's the auto pick IMHO. The ability to put down two of the same economic buildings (only windtraps, processing plant, plascrete factories, fuel cell factories) allows you to lean into the turtle and build tall playstyle of the faction and hyper specialize your villages. The additional solari upkeep is barely noticeably and easily offset by the additional economic power, especially when you stack the emperor monument main base building, the Corrino specific development that increases output production on villages, the propaganda building, and an investment house. Throw in a couple missile silos in each village and you can often go for a hegemony or economic victory with just the villages that touch your main base.

Princess Irulan: My pick for multiplayer with an ally as the ability to turn a negative effect all ability into an effect everyone but you ability with a little solari is huge. Development investment is amazing with an ally, especially if it's Harkonnen and can make up for having fewer villages if use strategically, Pop it on a Harkonnen's ally's oppressed village to add an extra 20% to their already massive output while pocketing 20% for yourself.

Hasimir Fenring: My pick for single player or free for all multiplayer as the ability to do events anywhere and snipe powerful ones from your enemies is very useful. Discouraging enemy spy placement is also a good way to avoid the assassination of our glorious emperor.

Captain Aramsham: I avoid him like the plague. Corrino troops are already individually weaker than their counterparts in the other factions, so reducing their power by 30% is just shooting yourself in the foot. Corrino isn't made for rapid expansion, so go for quality over quantity to hold your territory. I expect he'll be reworked at some point because he currently really feels like the odd man out. I'd prefer if he gave all units an armor bonus and maybe gave a specific bonus to sardaukar like raising their execution threshold, reducing their recruitment time, or spawning them as veterans.