In time, either deck may prove to be great for competitive play, but right now, I'm not convinced either are as competitively viable as Rise of the Floodborn 's Amethyst/Steel deck , which is arguably still the most powerful Starter Deck to date
It doesnt mean that the creature is inherently harder to block or cant be blocked by certain creatures
Thassas Oracle is generally seen as the more powerful one, and the other two are generally better suited to more casual levels
Another example of the Charmander line always taking its place as a chase card in the Pokmon TCG
It works, flavour-wise, as the Polar Kraken keeps eating your lands, but generally big creatures are afraid of creature-specific removal even without an increasing tumour of a downside
Most Commander players have seen how powerful Winota, Joiner of Forces can be in all power levels of Commander, including cEDH