You can't take the picture of the one you are riding on. Just randomly selected. But they both are okay for you as a traveler I'd say honestly without commenting on other bad events happened in the past. Irish is also fine but they have fewer sailings and if you miss one you're going to wait for another 3 hours mostly.

I am not Briton but what i can tell you is that yes it looks apparently little better on the french side but when it comes to restaurants the Dover port has a burger king and costas at least whereas the french side has just useless vending machines without staff which deduct money for sure but you don't necessarily get your product. They also have a coffee shop above duty free. But ferry operators staff at Dover is more friendly than in France. They always give smaller gifts to children which i never experienced on the french side in last 10 years. These small things mean a lot if you have a longer journey behind or ahead. How it looks is not more important for me. As an EU citizen i also say that Brexit was a mistake i wouldn't have migrated to UK for better life it's for sure on EU side but not sure how long it will be as we also have same corrupt politicians who are liars as well.