Hi Chiel ❤ I'm the silent supporter who comments on your posts every two years, lol. But, since you're going through such a special phase preparing to your wedding, I find myself having to comment here more often. It's so fun to follow and I'm so happy for you! ヽ(✿゚▽゚)ノ
So! To answer your question, I feel like either way is great, but I'm more inclined to say I prefer releases in routes than the whole game at once. I live in Brazil and the dollar is quite expensive these days. Because of that, it's easier for me to organize my finances to buy games that are released by route, since they are cheaper and come out periodically.
This is a very specific case and I don't think it applies for most of your fanbase, so I think what matters most is your own style as a dev. I've seen good comments talking about you as a perfectionist (same here!) and how route releases can have a negative impact on your polishing plans. In the end, I can say for certain that what feels right for you is the best approach!
We'll be fine and here anyways!
See you later! ❤