Schick Injector Durability Question

I have been down and came out of the rabbit holes of DE and SE and recently discovered the magical smoothness of a Shick Type O Clone which no other razor in the 60+ I have tried can compare to and has me on a journey to sell off my entire collection of razors.

Before I go down the rabbit hole of injectors trying them all, I believe the adjustable would meet my needs to adapt the level of efficiency on a whim. However, as these are one of the later models, I am curious to know how durable they are compared to the non-adjustable versions which appear to be much better made.

I know from reading many forum comments the injectors get milder the further up the line one goes from L to O. But is there any real difference in the quality/durability of the earlier versus late model injectors, specifically the adjustable model?

There are permutations, as with DE, of handle and blade. Some heads are identical, some aren't. Does an original twin blade or modern blade change the performance?