Disregarding the movements themselves for a moment, there's far more information on building a bigger bench than building a bigger incline bench. You can watch many a good technique video, find various bench training programs, or articles on training the bench. Granted, there's a lot of bad information too, but there's plenty of good.
So if you make bench the priority, you can draw from all of that to help you with your training. Now some of it may still be applicable to incline bench, or other pressing exercises, but not all of it will, and you'll have to be able to figure out what still applies. So without even getting into the exercise itself, there's a big argument for favouring bench over incline press.
Regarding the actual exercises, what's most important is that you train, and get stronger at a big, full ROM pressing exercise. Bench, incline bench, overhead lifts, which lifts you train and prioritize is less important.