Your example is one of opinion, mine is one of fact. So you're still insisting that decline bench press is harder than incline with a bar? lol.
Right...it is my opinion that Dorian has 6 Sandows compared to Nasser's 0, huh?
As for the decline bench press, it mobilizes the most pectoral muscle mass, and thus is more effective than the incline one. The incline one might be harder because it involves less the pecs and more the front delts and triceps which are smaller muscles, hence the same weight might feel heavier on the incline than on the decline. But the issue is effectiveness for pec development, and the decline is more effective.
Why not just actually go inside a gym for a change and try both exercises?
Trust me, towel head: I have forgotten more kinesiology than you've ever known.
SUCKMYMUSCLE