The ASRock X870E Taichi wins in 9 out of 14 comparable specs, with 3 ties. Its biggest advantage is VRM Phases (170% better).
TUF GAMING B550-PLUS WIFI wins in 2 specs (PCIe x1 Slots: 200% better).
Recommendation
Choose X870E Taichi if you want the best overall performance — especially vrm phases.
Choose TUF GAMING B550-PLUS WIFI if pcie x1 slots matters more to you.
