I would say optimally you use the same type of holster for all your pistols so that drawing is the same each time. In reality not all manufacturers make holsters for every single model out there.
For example I use the SERPA retention holster for all my guns that Blackhawk makes one. My FNP-45 is not on their list yet so I use a leather holster for that. In the future if a SERPA holster becomes available for the FN I will buy it.
I personally have grown to dislike thumb safeties but on a 1911 you usually find one. :-)
I also like buying models that reuse holsters. EG the Sig P220 and P226 fit the same SERPA and other holsters. The FNP-45 fits a Sig P220 holster. My USP and USP compact fit the same SERPA. I have a 1911 SERPA that I used for three different 1911's. Optimal is optimal but I know there will always be the exception. :-)