The largest Palm love of my life is
Parajubea cocoides, the Quito Palm. It's the highest-altitude growing palm in the world, up to 3,800 meters above sea level. The seeds are edible, too, like tiny coconuts.
After this, I'd say my fave is most likely
Socratea exorrhiza (Chonta) or
Mauritia flexuosa (Morete). I'll have to troll the archives for photos of those.