I have 3 and will be offloading 1. My Gretsch Bronze has more overtones and a bottom end thump and my Gretsch Cast Aluminum has less overtones and a nice pop. Both are 6.5x14. I can pretty much cover anything between the two. The third doesn't seem to have a personality of its own, so it's going. I'd have to find something way different than the other two to justify another purchase.
I have two. One is wood and one is metal. Depending on the type of recording session you are doing as some prefer one particular sound over another. I tune both tight but the wood is a bit warmer and the metal snare drum has more pop to it.
I have three snare drums.
They all get used. 2 signia maple : a deep 14x7” with die cast, for outdoor show or large venue, another 14x5,5 with triple flange, for medium or indoor venue.
i also have a Tama SLP maple 14x5,5 which looks like a duplication, I had it before the others. I use it for rehearsal for it is much lighter in weight and sound.
i have recently sold my metal snare, I loved it but it didn’t get enough (hardly any) use.