Which version of Tyrant? RKT beats depowered Tyrant. Fully powered Tyrant is near the equal of Galactus and therefore way above even the most powerful Skyfather.
GAL
GalacticStormSmart Alec Know-It-All
Full powered Tyrant would destroy him. If its the depowered version then id give the edge to RKT using Thanos' bouts with Odin and depowered Tyrant as a means to decide.