I play both quite often, so I'll try my hand at breaking this down.
Lucas's favorite game to play is keep away, and he's got plenty of tools to do it with. A good Lucas spaces with PK Fire while racking up quick damage with things like NAir, DAir, FTilt, and PK Thunder. Retreating PK Fire is hard to punish, and puts Lucas a good distance from his opponent. He kills largely with Fsmash and Dsmash if their timing's good, and very rarely with USmash unless they're positive it will hit. He's got tons of recovery options, be it Ropesnake, Magnet Pulling, and Zap Jumping, or as a very last resort, PK Thunder. His jump is huge, so a good amount of time he doesn't even need to use any of those options. PK Thunder, Dsmash, and Dair can all be used to edgeguard, have multiple hitboxes, and can be tough to avoid. Overall, he's got a lot going for him, and can dish out some damage.
But...
His weakness is range, and overall trick predictability. The main things to keep in mind when fighting a Lucas player is Nair can land laglessly into jabs(IE keep shielding when he lands), and learn how Lucas gets up for Gerudo chains. Main modes that seem to rack up damage on him are UAir and Gerudo followups. Ftilt is a pain to deal with, but can sometimes be predicted if Lucas is walking, not running up to you. Offstage is where he can start getting predictable. Yeah, he's got some cool tricks at his disposal, but Magnet Pulling and Zap Jumping are linear and can be telegraphed. Stomp him. If he recovers high, it actually might not be a bad idea to FoG up and attack him with UAir, or you can wait for him to come down and attempt to juggle him with Uair. Otherwise, he's clear for a stomping at stage level. Below the stage, Ganon should be able to take him out around and below the edge, unless it's PK Thunder. If you're the one recovering, he can pretty much do the same to you. Be as erratic as you can and use PK Thunder as an advantage to refresh Dark Dive/Gerudo. Otherwise, be careful of the BAir spike. It's deceiving where it hits to spike you, and spikes fairly well. If you're spiked above the stage, you should be able to Dark Dive to the edge.
Overall, I see the two of them as opposite ends of the spectrum. Ganon deals a lot with one blow, while Lucas tends to get in multiple hits to do the same amount. Both can edgeguard each other really well, the differences being Lucas has a spammable projectile, and Ganon being heavier.
Due to PK Fire, I give it in Lucas' favor, 60-40, or possibly 55-45.