While not the strongest offerings in the Commander series, they are an improvement over last year and have a lot of interesting build-around commanders and fun new cards, so in some sense, you should probably go with whichever deck fits your play style best, if you have to choose just one
Baloo, Von Bruinwald XIII has the Bodyguard keyword which means that whenever an enemy character challenges one of the players characters, they have to target this card instead
If you need specific cards, buy singles
The Fugitive Doctor Loxi: Giving a set cost for the flashback is really neat actually
Another important pair of words on this card is nonland permanent, and I'm sure you know of great artifacts, enchantments, and planeswalkers that cost less than 3 and want a second chance
This card can be used to punish decks that want to draw a ton of cards or as a way to stock the graveyard for decks that have uses for the cards that they and their opponents mill or discard