slimefoot or mycotyrant

So I’m fairly new to MTG and am building my first deck outside of a precon and wanted to know which would be better to build around.

I like how Tyrant can spawn fungus and can just become a huge beat stick. The down side is that you have to put permanents in the graveyard, which isn’t too bad. It just sucks that you will lose out if you mill sorcery or instant cards.

Slimefoot is good as it’s more reliable in getting the job done. Though with him you have to be more set up and have other stuff out to make saporlings. But you don’t have to worry on losing out your non permanent cards to activate his ability.

Any help would be appreciated.