Solved RAID-5 with fewer high-capacity drives or more low-capacity ones?

If I want to construct a RAID-5, I am wondering, whether I should use 3 × 6 TB, 4 × 4 TB or 5 × 3 TB? Each configuration would have 12 TB of redundant storage. From an efficiency standpoint, which should I choose? Obviously, if one of the drives in the first configuration goes bad outside of the warranty period, its replacement cost is going to be higher. What are other considerations?

Increasing the number of drives in RAID 5 increases return on investment but it also 1/ increases the likelihood of simultaneous drive failures and 2/ lengthens RAID rebuild times.

Some other considerations are 3/ external enclosures with 5 drive bays very often tend to be more expensive compared to ones that only have 4 drive bays and 4/ you might also want to take into account differences in cost per GB between different drive capacity choices when determining the total cost and 5/ RAID 5 is not resilient against simultaneous drive failures (unlike e.g. RAID 6) and 6/ RAID 5 is not resilient during a RAID rebuild while 7/ increasing the number of drives in RAID 5 also increases the likelihood of a single drive failure (which can be important due to both #6 and #2).

Finally yes, a larger capacity drive generally has a higher replacement cost, but 8/ the likelihood of having to replace a drive before the warranty runs out is decreased as a result of having to depend on fewer drives, BUT... 9/ if you are planning to add a hot spare, then the choice of drive capacity will also affect the cost of the hot spare and 10/ choosing to add a hot spare also affects the total cost of the whole RAID 5 solution and the return on investment thereof.