Looks like bards are winning, especially given the folks who have said they’ve played multiple bards so the numbers in the poll will be understated.
But still a good spread, and I suppose it’s not surprising that the CHA based characters are edging it. Or that druids are lagging with two possible druid companions.
I think the companions' canon classes play a role. Bards really slot well into the mix with their classes, and since they are so versatile they work with most party compositions.