The Lian Li O11 Vision is the objective winner of this comparison, securing six out of eight total specification categories. Its most significant advantage over the Lian Li A4-H2O is its maximum cooler height, which is 216% better. This substantial difference in internal clearance allows the O11 Vision to accommodate much larger cooling solutions than its counterpart, providing greater flexibility for high-performance hardware configurations that require significant thermal management space.

Choose the Lian Li O11 Vision if your build requires extensive room for large cooling components to maintain optimal temperatures. Conversely, select the Lian Li A4-H2O if your primary priority is the MSRP, as it holds a 28% advantage in that category. This makes the A4-H2O the more suitable option for users focused on cost efficiency, while the O11 Vision remains the superior choice for those prioritizing hardware compatibility and cooling capacity.