Both of them care about permanents with mana value 3 or less in your graveyard
For many, having a card signed by its artist is a way to connect with a game on an axis thats special to them
Sun Titan does net you card advantage but manages to get less powerful as he remains in play rather than more brutal due to running out of viable targets
Instead of taking the traditional tribe-buffing approach, Orvar instead benefits a Wizard tribal deck by copying a permanent when it is targeted by one of your instant or sorcery spells
These topics are more generic, such as manabase, ramp, card draw, etc
While primarily a Commander card, especially with the partner mechanic and being printed in the Neon Dynasty Commander set, I have seen Yoshimaru appear in a handful of Legacy Boros decks where you're able to cast a good number of aggressive legendary creatures, which is all Yoshimaru wants: good friends