Current reliability assessments for mid-to-far offshore wind power transmission systems predominantly focus on single topologies, lacking systematic comparisons of emerging configurations (e.g., hybrid rectification), particularly in evaluating long-term operational impacts and dynamic effects of redundancy design. This study addresses these gaps by employing reliability block diagrams (RBD) to develop failure-rate-driven models for five topologies: low-frequency AC (LFAC), modular multilevel converter-based high-voltage direct current (MMC-HVDC), uncontrolled rectification (UR), series hybrid rectification (SHR), and parallel hybrid rectification (PHR). Under assumptions of independent failure events and static operational loads, the analysis reveals: 1) Dynamic reliability rankings over time—LFAC initially outperforms others due to structural simplicity, whereas UR surpasses competitors in long-term scenarios owing to reduced component counts in onshore converters; 2) Consistently minimal reliability differences between SHR and PHR, with gaps narrowing as submodule redundancy increases; 3) A crosspoint in LFAC-UR reliability curves, highlighting structural trade-offs between short-term risks from offshore converter complexity and long-term benefits of onshore component minimization. The framework enables lifecycle-oriented reliability predictions, providing critical insights for optimizing topology selection and redundancy allocation in offshore wind transmission systems.