the reason why we won't answer the same way for pedals, is because, by and large, the FUNCTION of each pedal is different from each other.
do all gruppos shift gears? yes.
do all pedals help you pedal the bike? yes.
BUT. pedals have different cleats, stack, and float. speedplay cleats wear faster than the rest. Time cleats are the most difficult to find of the major brands, which may be an issue. look cleats are light but usually made of polymers ( at least the mid end ones are), and let me tell you I've seen way more look pedals smashed up in accidents than a sturdy, reliable shimano steel pedal.
why do you not like shimano JUST BECAUSE they don't use so much carbon? that is a rather irrational thinking there.
not saying that carbon isn't nice, (we all mostly ride carbon, anyway.) do you like the aesthetics of carbon, perhaps? I personally think that the dura ace cranks (especially the 7900, or the 900) looks really badass and would look really slick on a black cannondale supersix.
The function of each pedal is no different than each groupset, groups pedal, brake and shift....pedals turn the cranks. They may have slightly different characteristics like stack height and float, but they all have stack height and float, and to most people that's not much different than crank length, hood shape, how they shift, brake performance. So they both do a task.
I don't dislike shimano at all. I think that Dura Ace Di2 is probably the best functioning group there is, and I like the aesthetics, just not as much. I think the carbon makes it look better, but I also think that it performs better in a lot of applications like cranks. One day soon, Shimano will only make carbon cranks for Dura Ace. Just like there really aren't any top of the line aluminum frames anymore. Aluminum is for Land Rovers and cans and stuff, not $500 cranks, however good they are at forging aluminum, I'm sure if Shimano put in the work the could become the leaders in carbon cranks.
I guess why Shimano isn't my top choice is because it's the most common. It's not the lack of carbon, it's that probably 70% of road bike have it, and why Campagnolo sounds appealing is not just that it's made in Europe, but that it's rare. I know if you live in a big city, you probably see it alot. But I'll go for a ride today, and I'll count how many bikes I see out there have it on. I wouldn't be surprised if I didn't see any.