So, what's the better ship? Steve and Peggy, or Steve and Bucky?

Personally, I think that Stucky is better than Steggy, and here's why:

Peggy Carter (616/199999) as a character was always better without Steve Rogers. In my opinion, the best of Peggy was in Agent Carter (the show), where we saw her move on from Steve and WWII, and into the future of the SSR and eventually S.H.I.E.L.D., is better than anything we've seen from Peggy anywhere as, where she was just 'Steve's love interest'. Even in Endgame, they boiled her down to that.

Bucky however was at every important moment we saw Steve, he was there in The First Avenger, his relationship with Steve was literally the plot in The Winter Soldier, and it was also the driving force for Steve in Civil War. Not to mention, he was with Steve till the end of the line in Infinity War and Endgame.

So, my reasoning is essentially that we've always seen Bucky with Steve when it mattered most, and that Peggy was so much better without him.
Steggy vs. Stucky