In a Highlander deck like Commander, you can add both, but otherwise I'd do four of the first
You may well have to pick some things you don't want to and likely over things you did want and then shoehorn these random life gain things into your deck that you otherwise don't need or have better options you would rather have in the slot
Because it is only then that you know you are playing Commander the way it was meant to be played.
Credit: Wizards of the Coast Zimone, Paradox Sculptor Marcy: Another very well costed 4 CMC creature, and the doubling ability is very nice
Paired with Lathril, it can do some real work, and can also just be a swell Aura to run in a non-Enchantress deck
Urza, Lord High Artificer is a great way to easily achieve Leonardos mana sink, and Cybermen Squadron is a hysterical way to multiply your Thopter tokens like bunnies