For all its glitz and glamor, it's not an immensely powerful card, and it really only fits in decks that either care about counters or intend to gift your opponent creatures, as with Grismold, the Dreadsower and friends
As you're limited by colors here, Sidisi seems more likely to find a spot in the 99 than as a commander in her own right, but she's going to fit into a ton of decks
Cloud gives you all the agency, which makes it a very powerful Commander option
This is largely down to his ridiculous +1 ability, which can nullify any threat while also bolstering Okos loyalty, but his +2, which makes a Food token, is no slouch either
So it has the floor of also being able to Shock planeswalkers
Additionally, a player usually does not get priority in response to a triggered ability they control